Type-check tests

[Methuselah96]

In #4487 we switched from ts-jest (which runs type-checking on test files) to Vitest (which does not).

This PR runs type-checking on the tests to make sure they pass.

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[markerikson]

Hmm. Apparently the optimization I added / copied that tries to skip tests if there are no src changes is skipping the tests here too :(

While you're at it, can you try tweaking the condition to run if there's changes to .github?

Worst case, just kill the condition and always run the tests for now.

[Methuselah96]

Odd test failure for TypeScript 4.1. I'll take a look later.

[Methuselah96]

rxjs types only supports >=4.2 👀

  "name": "rxjs",
  ...
  "typesVersions": {
    ">=4.2": {
      "*": [
        "dist/types/*"
      ]
    }
  },

[Methuselah96]

I think we're good to drop testing against TypeScript 4.1? It came out on 11/19/20 so it's older than the 2-year support window defined by DefinitelyTyped.

[markerikson]

Yep, absolutely! We've generally done rolling TS version compat in our minor releases anyway, so let's drop 4.1 from the test matrix. (Might as well add 5.0-beta while we're at it?)

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