Fix JS tests to work with React 17 and 18

[igorschoester]

React can only be present once on a page. Therefor, in WP, we are reliant on whatever version is included there.
To make this happen we have this configured as external, plus use the WP element package.

However, WP element is set to an older version in our code. This version still uses React 16.
For our built code this does not matter, due to the external. But for our tests, it does.
It turns out our tests start failing if we upgrade WP element to a version that is used in WP 6.2 (see #20003)

This issue is meant to tackle our JS tests, to let them work with React 17 or even 18.
Bonus points for upgrading our React version in the process.

Some more tech info:

• Regarding our test suite
  • We are using Enzyme, which won’t be able to work with React 18: https://dev.to/wojtekmaj/enzyme-is-dead-now-what-ekl
  • We are sometimes using react-test-renderer, version 16
  • It is not straight forward to just upgrade here
• Dependencies in packages might conflict with those in the root. Could investigate nohoist here

[vraja-pro]

Problem: JS lint test doesn't recognise import of createReduxStore and register from @wordpress/data.
Possible reason: We are not bundling @wordpress/data in the zip, and we rely on window object instead.
Temporary solution: We added ignore lint comment for that import in both packages/js/src/settings/store/index.js and packages/js/src/academy/store/index.js. Search for import/named for other instances.

[igorschoester]

Replaced by #20593