chore: migrate tests to vitest

[mattjennings]

TODO:

• migrate jasmine memory usage reporters to vitest

===:clipboard: PR Checklist :clipboard:===

• 📌 issue exists in github for these changes
• 🔬 existing tests still pass
• 🙈 code conforms to the style guide
• 📐 new tests written and passing / old tests updated with new scenario(s)
• 📄 changelog entry added (or not needed)

==================

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[mattjennings]

@eonarheim at long last the tests are passing. let me know what you think of how i handled the TextSpec tests.

Also IIRC this still lacks the memory tracking and other custom karma reporting stuff. would you want that done in this PR?

(oh and we still need to test that the browserstack karma tests still run... seems like the workflow for that only runs on commits to the main branch)

[mattjennings]

managed to migrate the engine leak & memory reporters, although it took a bit of rigamarole. Mainly because, as opposed to karma, the reporter runs in node and not the browser. So I have to track the data needed separately in some global hooks within the browser environment, which the reporter then reads and creates the logs if needed.

However, it seems the memory tracking is regularly reporting >1 mb, so I'm not sure if it's tracking properly or if things have changed with the new browsers. My only theory is that because the timing where memory is read is during an afterEach before the test's afterEach, it's running before any potential cleanup. The timing of this is not something that's easy to control, unfortunately. I did try to prove this theory by doing the memory analysis on the next test's beforeEach, but it didnt seem to change the results, so it may not be an issue.

Implementation is done in src/spec/vitest/__reporters__/memory.ts and src/spec/vitest/__reporters/memory.setup.ts