chore: upgrade eslint

[leafty]

Upgrade eslint to version 9. Note that the current version is 10, but some important plugins are not compatible yet.

Important changes:

• The eslint configuration is completely different and is now found in eslint.config.msj. Our current setup has been migrated, though we should most likely revise the rules and re-enable important checks (e.g. prop types in react for javascript)
• The React linters are now a lot more comprehensive and catch more code quality issues. This is why a lot of code files have been edited to have a TODO item to fix deviation from React rules.

A lot of the new issues flagged by eslint have to deal with the fact that setState() should not be used in synchronous code inside a useEffect(). The reasons why this is not a best practice is detailed in length in the React docs: https://react.dev/learn/you-might-not-need-an-effect.

/deploy

[RenkuBot]

You can access the deployment of this PR at https://renku-ci-ui-4063.dev.renku.ch

[ciyer]

LGTM!

[RenkuBot]

Tearing down the temporary RenkuLab deplyoment for this PR.