[JENKINS-72387] Provide JUnit5 Class (static) context for JenkinsRule

[bstopp]

See JENKINS-72387.

I'd like to add support for creating one running Jenkins instance per Test Class, when using the JUnit5 extension points.

Due to how the JenkinsRule and underlying contexts expect population of the Jenkins testDescription, some refactoring of was required. This was necessary to find all annotations that may exist in all contexts - which would define the pre-test state of the Jenkins instance.

Testing done

All previous tests pass, including the original which tested code this PR has refactored/modified (JenkinsRuleResolverTest).
Added an additional test (JenkinsRuleClassResolverTest) to ensure the explicit feature was validated.

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[timja]

Rather than reflection would it be cleaner to explicitly register it do you think?
https://junit.org/junit5/docs/current/user-guide/#extensions-registration-programmatic

[bstopp]

I was trying to avoid having different solutions for the different contexts.

@WithJenkins on the class or method gets you test-method parameter injection. Having a different approach for the class test context creates additional complexity for the consuming devs.

[basil]

[ERROR] io.jenkins.plugins.fontawesome.SvgTagITest -- Time elapsed: 5.511 s <<< ERROR!
org.junit.jupiter.api.extension.ParameterResolutionException: Failed to bind to localhost/127.0.0.1:36687
        at org.jvnet.hudson.test.junit.jupiter.JenkinsExtension.resolveParameter(JenkinsExtension.java:107)
        at java.base/java.util.ArrayList.forEach(ArrayList.java:1596)
        Suppressed: java.lang.IllegalStateException: Jenkins.instance is missing. Read the documentation of Jenkins.getInstanceOrNull to see what you are doing wrong.
                at jenkins.model.Jenkins.get(Jenkins.java:814)
                at org.jvnet.hudson.test.RemainingActivityListener.problem(RemainingActivityListener.java:71)
                at org.jvnet.hudson.test.RemainingActivityListener.onTearDown(RemainingActivityListener.java:59)
                at org.jvnet.hudson.test.JenkinsRule.after(JenkinsRule.java:499)
                at org.jvnet.hudson.test.junit.jupiter.JenkinsExtension.afterAll(JenkinsExtension.java:70)
                ... 1 more
Caused by: java.io.IOException: Failed to bind to localhost/127.0.0.1:36687
        at org.eclipse.jetty.server.ServerConnector.openAcceptChannel(ServerConnector.java:344)
        at org.eclipse.jetty.server.ServerConnector.open(ServerConnector.java:304)
        at org.eclipse.jetty.server.Server.lambda$doStart$0(Server.java:402)
        at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
        at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
        at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
        at java.base/java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:1024)
        at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
        at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
        at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:151)
        at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:174)
        at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:596)
        at org.eclipse.jetty.server.Server.doStart(Server.java:398)
        at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:93)
        at org.jvnet.hudson.test.JenkinsRule._createWebServer(JenkinsRule.java:885)
        at org.jvnet.hudson.test.JenkinsRule.createWebServer(JenkinsRule.java:803)
        at org.jvnet.hudson.test.JenkinsRule.createWebServer(JenkinsRule.java:791)
        at org.jvnet.hudson.test.JenkinsRule.newHudson(JenkinsRule.java:741)
        at org.jvnet.hudson.test.JenkinsRule.before(JenkinsRule.java:409)
        at org.jvnet.hudson.test.junit.jupiter.JenkinsExtension.resolveParameter(JenkinsExtension.java:104)
        ... 1 more
Caused by: java.net.BindException: Address already in use
        at java.base/sun.nio.ch.Net.bind0(Native Method)
        at java.base/sun.nio.ch.Net.bind(Net.java:565)
        at java.base/sun.nio.ch.ServerSocketChannelImpl.netBind(ServerSocketChannelImpl.java:344)
        at java.base/sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:301)
        at org.eclipse.jetty.server.ServerConnector.openAcceptChannel(ServerConnector.java:339)
        ... 21 more

with similar failures in io.jenkins.plugins.forensics.blame.BlamerFactoryITest, io.jenkins.plugins.forensics.delta.DeltaCalculatorFactoryITest, io.jenkins.plugins.forensics.miner.MinerFactoryITest, and io.jenkins.plugins.forensics.reference.SimpleReferenceRecorderITest