[JENKINS-69658] - CSP compatibility for summary.jelly

[shlomomdahan]

JENKINS-69658

This PR is an extension of https://github.com/jenkinsci/junit-plugin/pull/451 to fix the inline JS in the summary.jelly file.

The failureSummary.js file had to be changed so that it can handle event delegation as some of the elements we are targeting with the fix do not actually appear in the html until the parent is expanded.

Testing done

• STATUS QUO: No changes implemented. This is the intended functionality.

https://www.loom.com/share/796f46d313e34c8cbbaf85963c1ffb59?sid=20dc0f68-ddca-4f88-a977-1580816dcdab

• NON RESTRICTIVE: This is the behavior after implementing the CSP changes. The code is working just as before and there is no regression in functionality.

https://www.loom.com/share/f7a8117e45a54da5a719599f0d1adb08?sid=8c812aef-9c9a-4a81-b662-c49229d68dbf

• RESTRICTIVE: This is with CSP restrictive mode enabled. It is working correctly as intended without any issues.

https://www.loom.com/share/6e3642baf5934fe59e2efdc3f3f0ec3b

Submitter checklist

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• [x] Ensure you have provided tests - that demonstrates feature works or fixes the issue