bake: fix the big regressions

[paperdave]

this also does some work to make multi-threaded SSR, but does not actually start the threads to do so.

[robobun]

❌ @paperdave, your commit 3e00596 has 12 failures in #7241:

test/js/bun/http/bun-serve-static.test.ts - timeout on 🐧 3.20 x64

test/integration/next-pages/test/dev-server.test.ts - 1 failing on 🐧 3.20 x64

test/integration/next-pages/test/dev-server.test.ts - 1 failing on 🐧 3.20 x64-baseline

test/js/node/child_process/child_process.test.ts - 1 failing on 🐧 3.20 aarch64

test/js/node/child_process/child_process.test.ts - 1 failing on 🐧 3.20 x64

test/js/node/child_process/child_process.test.ts - 1 failing on 🐧 3.20 x64-baseline

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 22.04 x64-baseline

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 22.04 x64

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 3.20 aarch64

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 3.20 x64

test/js/node/test/parallel/fs-watch-recursive-linux-parallel-remove.test.js - 1 failing on 🐧 3.20 x64-baseline

test/js/third_party/jsonwebtoken/async_sign.test.js - 1 failing on 🐧 11 x64

test/v8/v8.test.ts - 22 failing on 🐧 3.20 aarch64

test/v8/v8.test.ts - 22 failing on 🐧 3.20 x64

test/v8/v8.test.ts - 22 failing on 🐧 3.20 x64-baseline

test/js/bun/http/serve.test.ts - SIGTRAP on 🐧 3.20 aarch64

test/js/bun/http/serve.test.ts - SIGILL on 🐧 3.20 x64

test/js/bun/http/serve.test.ts - SIGILL on 🐧 3.20 x64-baseline

test/js/node/test/parallel/timers-ordering.test.js - 1 failing on 🐧 22.04 x64-baseline

test/js/bun/plugin/plugins.test.ts - segmentation fault on 🐧 11 aarch64

test/cli/hot/hot.test.ts - timeout on 🪟 2019 x64

test/cli/hot/hot.test.ts - timeout on 🐧 3.20 aarch64

test/js/third_party/pino/pino.test.js - segmentation fault at address 0x25b4f974858 on 🪟 2019 x64

test/js/node/fs/fs-promises-writeFile-async-iterator.test.ts - 1 failing on 🍎 13 aarch64