Replace JSR-305 annotations with spotbugs annotations

[MarkEWaite]

Replace JSR-305 annotations with spotbugs annotations

Annotations for Nonnull, CheckForNull, and several others were proposed for Java as part of dormant Java specification request JSR-305. The proposal never became a part of standard Java.

Jenkins plugins should switch from using JSR-305 annotations to use Spotbugs annotations that provide the same semantics.

The mailing list discussion at https://groups.google.com/g/jenkinsci-dev/c/uE1wwtVi1W0/m/gLxdEJmlBQAJ describes the affected annotations and why they should be replaced with annotations that are actively maintained.

An OpenRewrite recipe https://docs.openrewrite.org/recipes/jenkins/javaxannotationstospotbugs provides this upgrade, though it upgraded the Priority annotation and that annotation needs to remain because it is used by RestEasy.

Testing done

Confirmed that automated tests pass.

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