Adapt to jenkinsci/plugin-compat-tester#505

[basil]

Adapt to jenkinsci/plugin-compat-tester#505 by:

• Upgrading PCT to the latest release
• Removing -DoverrideWarAdditions=true which has now been removed from Maven HPI plugin
• Excluding org.jenkinsci.plugins.matrixauth.integrations.casc.ImportTest because Switch JCasC test to RealJenkinsRule matrix-auth-plugin#136 still has not been merged and released

Closes #1912

[basil]

checking to see what is left for this task.

Not a whole lot, as it turns out: just jenkinsci/maven-hpi-plugin#461 (and therefore jenkinsci/plugin-compat-tester#505) from the Jenkins side, based on my preliminary testing. I will run it through the ringer in this next build. The above two PRs will require testing from "the other consumer."

[basil]

Pretty decent run overall, just 4 failures:

• org.jenkinsci.plugins.matrixauth.integrations.casc.ImportTest.should_support_configuration_as_code
• org.jenkinsci.plugins.matrixauth.integrations.casc.ImportTest.should_support_configuration_as_code_ambiguous_format
• org.jenkinsci.plugins.workflow.job.WorkflowRunRestartTest.interruptedWhileStartingMaxSurvivability
• org.jenkinsci.plugins.workflow.job.WorkflowRunRestartTest.interruptedWhileStartingPerformanceOptimized

The first two are our old friend jenkinsci/matrix-auth-plugin#133.

[basil]

The only failure in https://ci.jenkins.io/job/Tools/job/bom/job/PR-1908/11/ was a flake regarding DNS resolution of github.com. Otherwise all tests passed.

@jenkinsci/bom-developers I require a merge of this for my ongoing PCT work.

[MarkEWaite]

I think that the DNS resolution failure in the test should not block the merge of this pull request. Merging and accepting that if there is a surprise in that merge, we will revert it.