Upgrade to badge-plugin 2.x

[strangelookingnerd]

Restores compatibility with latest badge-plugin version. See discussion in jenkinsci/badge-plugin#190

This also updates the baseline to 2.440.x

Testing done

Ran existing tests without issue. I did only try a limited set of manual UI tests, a second pair of eyes would be appreciated.

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

[strangelookingnerd]

The fixes to the UI tests are required for the baseline upgrade and the changes that came with it.

@jenkinsci/build-monitor-plugin-developers I'd be happy for a timely review and release 👍🏼

[basil]

Thanks for the PR. I am just keeping this plugin on life support. I don't use it and I have no time to do manual testing.