Add PowerMock to banned dependencies

[basil]

PowerMock tends to wreak havoc when it is on the classpath at the same time as Mockito in newer Java versions, so ban this dependency. I have not banned org.powermock:powermock-reflect since it is actually safe and some plugins (like Blue Ocean) depend on it. But I have banned every other PowerMock artifact.

Testing done

I tested this in context in a plugin that used powermock-reflect. Attempting to add another PowerMock package caused (as expected):

Rule 4: org.apache.maven.enforcer.rules.dependency.BannedDependencies failed with message:
org.jenkins-ci.plugins:build-blocker-plugin:hpi:1.7.10-SNAPSHOT
   org.powermock:powermock-module-junit4:jar:2.0.9 <--- banned via the exclude/include list

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Add item to Submitter checklist

[MarkEWaite]

Thanks!