Makes AuthorizationContainer extend Describable

[Vlatombe]

This is needed for compatibility with core tests updated by jenkinsci/jenkins#10426

Testing done

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[Vlatombe]

ping @daniel-beck (btw, @jenkinsci/matrix-auth-plugin-developers is empty)

[daniel-beck]

Is this a prerequisite for the core change? What makes matrix-auth special that it breaks things, while the core PR is generally backward-compatible?

[Vlatombe]

This is required to apply the changes to test/ module, otherwise compilation fails with

[ERROR] /Users/vlatombe/projects/github.com/jenkinsci/jenkins/test/src/test/java/hudson/model/QueueTest.java:[805,20] types hudson.model.Describable<T> and org.jenkinsci.plugins.matrixauth.AuthorizationContainer are incompatible;
[ERROR]   class hudson.model.QueueTest.AliceCannotBuild inherits abstract and default for getDescriptor() from types hudson.model.Describable and org.jenkinsci.plugins.matrixauth.AuthorizationContainer
[ERROR] /Users/vlatombe/projects/github.com/jenkinsci/jenkins/test/src/test/java/hudson/model/FingerprintTest.java:[659,20] types hudson.model.Describable<T> and org.jenkinsci.plugins.matrixauth.AuthorizationContainer are incompatible;
[ERROR]   class hudson.model.FingerprintTest.NoInheritanceProjectMatrixAuthorizationStrategy inherits abstract and default for getDescriptor() from types hudson.model.Describable and org.jenkinsci.plugins.matrixauth.AuthorizationContainer

[daniel-beck]

I see, that makes sense and would indicate it's exclusive to my class hierarchy here.

Unsure whether I will have time to address this PR this week, but should be in a release next week.

[jglick]

Why not just adjust those two tests to use MockAuthorizationStrategy?

[daniel-beck]

This seems so much cleaner than before, thanks!