test: migrate react tests to vitest

[43081j]

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[43081j]

since we changed a file that the transform tests also depend on, we need to do both in one PR

so this won't build yet until i do that

the transform e2e tests are also a bit wonky. they depend on babel (which only runs in node), but the tests are written as browser tests. in vitest this just errors since babel tries to use things like process

karma will have been bundling and stubbing these out before. it may be that we have to tell vitest to bundle babel somehow

[43081j]

the tests are intertwined enough that im just going to do the rest in this PR all in one go

so it'll be a somewhat big PR but at least once its done, its all done 👀