Add disabled reproducer for mockito mocking inner classes in continuous testing

[holly-cummins]

The tests don't pass now (see #38987), but they will be fixed by incoming changes, and at that point we would like them to continue working.

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[holly-cummins]

Example of the tests running green when not-disabled (in a branch which has the test classloading update): https://github.com/quarkusio/quarkus/actions/runs/13837159879/job/38715858259

[quarkus-bot]

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