Add npm registry proxy in CI to test publication/installation #3157
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(Continuation of #3098)
Adds the ability to publish the monorepo to an ephemeral virtual registry in CI and install Web3's latest state in an arbitrary target project. This lets us run other projects' unit tests to verify that no breaking changes have been introduced.
Includes:
One thing to note about this is that it doesn't work very well when the target requires that installation be done with yarn. (Getting Truffle to work with this format was a little challenging.)
Truffle's tests are run as an "allowed failure" and CI will turn green without waiting for them to finish. This is done because these tests are mostly a pre-publication sanity check which might help us track breaking changes down to a specific PR if they occur.