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e2581306 - [CI] Credit mixin markers only for bases imported from `testing_utils`; legacy mixins share their names

[CI] Credit mixin markers only for bases imported from `testing_utils`; legacy mixins share their names The legacy cache and IP-Adapter mixins in `test_pipelines_common.py` are unmarked but have the same class names as the marked ones, so matching by bare name scheduled a `pipelines-cache` job whose `-m cache` run collected nothing and failed with exit code 5.