[JENKINS-71272] ensure proper confirmDelete jelly is used

[mawinter69]

In several Jenkins instances when deleting a Matrix run or a run of an axis the page that asks for confirmation was the one from Jenkins core and not the one provided by Matrix project plugin.

The Matrix Project delivers its own confirmDelete.jelly and puts it under .../resources/hduson/model/Run. This is the same location as in core which might lead to the wrong one taken if it is found first in the classpath for whatever reason.

This solves the issue for the price of duplication of the confirmDelete file.

Tested manually on a local Jenkins that showed the issue without this fix.

JENKINS-71272

Testing done

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
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• 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

[MarkEWaite]

Tested interactively and confirmed that the correct confirmDelete dialog is displayed.