[Fixes 18186] UX: Reorder build details page and auto-collapse SVN revisions

[alwaysalearner1234]

Problem

When a single job contains many SVN locations or revisions, the build details page (Run/index.jelly) becomes cluttered. Users are forced to scroll down past a long list of revisions just to reach the most useful debugging information, such as test failures and the changelog.

Solution

This PR introduces two major UI/UX improvements to the build details page:

1. Reordered Information Hierarchy: Reordered the sections on the build details page so that the most critical debugging information is presented first. The new order is:

   • Test Failures / Failed Tests
   • Changelog
   • SVN Revisions
   • Other less-critical build information

2. SVN Revisions Collapse: Added a lightweight, vanilla JavaScript snippet that automatically collapses the SVN revisions list if there are more than 5 revisions.

   • An interactive toggle (e.g. ▶ SVN Revisions (12)) is provided so users can expand the list if needed.
   • If there are 5 or fewer revisions, the default behavior is preserved and the list remains fully visible.

Testing Done

• Added RunIndexReorderingTest.java to verify the new DOM ordering (Test Failures -> Changelog -> SVN Revisions -> Other).
• Verified that 0 revisions or 1-5 revisions do not trigger the collapse behavior, maintaining backward compatibility.
• Ensured the JavaScript is robust and functions without relying on external libraries like jQuery.

/label bug
/label rfe

#14607

[MarkEWaite]

Closing because the pull request does not use the pull request template.

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