Migrate tests from Enzyme to React Testing Library

[radekmie]

As Enzyme is no longer supported and we already rely on a community-made workaround for React v17 and there's nothing sure for v18 we should push for getting rid of it entirely.

Support for v18 was requested in #1109 and added in #1129.

[radekmie]

Maybe we could try https://github.com/enzymejs/enzyme/issues/2524#issuecomment-1117039658 to buy us more time?

[ErnestTeluk]

Maybe we could try enzymejs/enzyme#2524 (comment) to buy us more time?

Unfortunately it did not work (tested on react 17), when it comes to react 18 there is one more blocker which is https://github.com/facebook/docusaurus/issues/7264 . So we have to wait for docusaurus 3.0 to come out anyway

[kestarumper]

This is a "current" state of knowledge of what we finished and what still needs to be done.

Done

• [x] #1266
• [x] #1271
• [x] #1268
• [x] #1270
• [x] #1258
• [x] #1269
• [x] #1299
• [x] #1301
• [x] #1302
• [x] #1303
• [x] #1304
• [x] #1298
• [x] #1294
• [x] #1312
• [x] #1318

Review

In Progress

• [ ] #1340 @zaxoavoki
• [ ] #1344 @kestarumper

TODO

• [ ] #1345
• [ ] #1346
• [ ] #1347