swingset unhandled promise lint fixes

[warner]

I ran the new scripts/lint-with-types.js tool on swingset today, and here's a list of all the Promises that it thinks are not being fully handled:

node ➜ ~/agoric-sdk/packages/SwingSet $ ../../scripts/lint-with-types.sh
yarn run v1.22.17
$ yarn lint:types&&yarn lint:eslint
$ tsc --maxNodeModuleJsDepth 3 -p jsconfig.json
$ eslint .

/home/node/agoric-sdk/packages/SwingSet/misc-tools/measure-metering/measurement-target.js
  68:7  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/src/kernel/kernel.js
  266:7  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/src/kernel/vat-loader/manager-nodeworker.js
  67:7  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/src/liveslots/watchedPromises.js
   83:9   warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises
  117:11  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises
  173:5   warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/src/vats/network/network.js
  335:11  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises
  511:3   warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/src/vats/plugin-manager.js
  157:11  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises
  184:11  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises
  208:7   warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/src/vats/vattp/vat-vattp.js
  131:9  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/test/basedir-promises-2/bootstrap.js
  14:9  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises
  29:9  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/test/basedir-promises-3/vat-right.js
  12:7  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/test/basedir-promises/bootstrap.js
  13:9  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises
  14:9  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises
  40:9  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/test/device-plugin/test-device.js
  81:3  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises
  97:3  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/test/gc-device-transfer/bootstrap-gc.js
  19:7  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/test/test-liveslots.js
  222:9  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/test/test-network.js
   91:9  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises
  182:9  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/test/test-queue-priority.js
  10:5  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/test/workers/vat-target.js
  60:5  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

/home/node/agoric-sdk/packages/SwingSet/tools/vat.js
  54:7  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises
  58:7  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises
  63:1  warning  Promises must be awaited, end with a call to .catch, end with a call to .then with a rejection handler or be explicitly marked as ignored with the `void` operator  @typescript-eslint/no-floating-promises

✖ 34 problems (0 errors, 34 warnings)

We should fix these.

[warner]

As we fix these, let's make a note here about whether they highlighted actual bugs, or if this is just busywork.