Use vite and vitest

[Gotos]

Switch to using vite and vitest instead of (plain) rollup, babel and jest. This will allow us to easily write type tests in the future thanks to vitests expectTypeOf and assertType.

[github-actions]

Pull Request Test Coverage Report for Build 7561408940

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-3.3%) to 96.719%

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Totals
Change from base Build 7478871871:	-3.3%
Covered Lines:	3699
Relevant Lines:	3840

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💛 - Coveralls

[Gotos]

Pull Request Test Coverage Report for Build 7561408940

* **0** of **0**   changed or added relevant lines in **0** files are covered.

* No unchanged relevant lines lost coverage.

* Overall coverage decreased (**-3.3%**) to **96.719%**

I assume that the coverage in vitest is calculated slightly differently from how it's done in jest. I'll look into this drop in coverage, see how to fix it.

Edit: Fixed. I just forgot to copy over the files excluded from the coverage and re-write one ignore statement.

[Gotos]

Now this is a weird issue.

Apparently fireEvent.click does not fire the onSubmit function of forms when running in vitest but does so in jest. I found a couple of stray StackOverflow questions that seem to run into the same issue and there hasn't been any solution besides switching from click to submit. I don't particularly like that this change is necessary, but I think I don't see a lot of value in trying to debug this further - if you disagree and would prefer staying with click, I can spend some more time trying to find a better solution though!