JENKINS-59813 pipeline-maven JacocoPublisher handle excludes properly

[enapps-enorman]

This is a proposed solution for JENKINS-59813

The jacoco report published by pipeline includes classes that should have been excluded.

If the pom declares "excludes" in the jacoco-maven-plugin configuration, then those patterns should be forwarded on to the JacocoPublisher so the generated report excludes those.

The proposed changes will look for any "excludes" xml elements in the jacocoPrepareAgentEvent elements and collect any patterns in there which are then passed through to the JacocoPublisher at the end.

Testing done

The JacocoReportPublisherTest was updated to exercise the impacted code path. Also manual testing of the locally built plugin solved my use case.

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[bguerin]

Thanks for you work and sorry for the delay !