Add GH Actions for UI tests

[kinow]

Ref: https://github.com/apache/jena/pull/2830#issuecomment-2466641867

Pull request Description:

This PR adds GitHub Actions for the UI tests.

Tested on my fork:

• Created a quick YAML version (knew it was probably broken, doesn't matter as I wanted to add it to my main)
• Pushed it to kinow/jena's main
• Then created PR to fix it, which now could be used to validate it worked
• 8 commits later, got it to work, tests took 1 min e2e, and 2 min the unit (because e2e is pure yarn, but for unit I used mvn -- just to make sure UI is not broken when Maven is used?)
• Squashed, cherry-picked the commit from this PR to prepare this PR
• Added the if to check for apache/jena as the repository

Now once this is merged we can rebase a dependabot or some other UI PR and :crossed_fingers: it will work.

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• [ ] Tests are included.
• [ ] Documentation change and updates are provided for the Apache Jena website
• [x] Commits have been squashed to remove intermediate development commit messages.
• [ ] Key commit messages start with the issue number (GH-xxxx)

By submitting this pull request, I acknowledge that I am making a contribution to the Apache Software Foundation under the terms and conditions of the Contributor's Agreement.

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See the Apache Jena "Contributing" guide.

[kinow]

To test the if that verifies the repository being apache/jena, I also created https://github.com/afs/jena/pull/209.

[afs]

Looks good.

8 commits later, got it to work

😄