Attempt to migrate to `@testing-library/react`

[xobotyi]

Current library that is used for testing of components is not compatible with react 18 therefore we have to switch to alternative fo be abl;e to move forward in future.

[xobotyi]

We're already two versions behind React, and the recent release of React 19 has pushed the testing library into a situation where they now need to introduce a built-in harness for SSR testing.
Hope the solution doesn’t keep us waiting too long!

If they wont deliver in closest month - ill write own harness.