[JENKINS-59846] Reintroduce automatic hyperlinking of URLs in JUnit test output, safely

[BonusLord]

Resolves #481 by reintroducing automatic linkifying of URLs in JUnit test output. After being converted into tags, the links are passed through an HTML sanitization library to ensure they are not malicious.

This is a slight rework of #555 that resolves some of the problems that the sanitizer was causing by only passing the hyperlinks through the sanitizer, while using the classic simple sanitization method for all other output text.

Some screenshots to illustrate what this looks like in practice:

Test code:

Test result page in Jenkins:

Testing done

• Added / updated test cases
• Ran mvn verify and verified that it succeeded
• Did some manual testing (shown in screenshots)

Submitter checklist

• Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• Ensure that the pull request title represents the desired changelog entry
• Please describe what you did
• Link to relevant issues in GitHub or Jira
• Link to relevant pull requests, esp. upstream and downstream changes
• Ensure you have provided tests - that demonstrates feature works or fixes the issue