feat(core): Add critial e2e tests file #31242
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This PR adds a new “essential” (aka golden) test file to most packages, think of it as a quick health check that covers each plugin’s absolute must-have functionality.
These tests are kept deliberately small, just enough to prove that the basics still work. If one of these ever fails, it’s a showstopper: we’ll fix it right away to keep our plugins in good shape.
While running the updated e2e tests, we spotted a missing test dependency in the React plugin’s generated library.
This change also brings in
@testing-library/dom
for React, so you can run end-to-end and unit tests straight out of the box.Next Steps