Method getMockForAbstractClass() is deprecated - replace in class EntityStorageBaseTest

All code changes look good to me.
For me it is RTBC.

There should be return types on the new methods.

Hey @quietone,
I have added the return type to the new methods in the Stub file as requested.
Please review.

The PHPStan job is failing, because the new return type introduced makes the added entry on the PHPStan baseline no longer needed. Needs to remove that entry (or regenerate the baseline).

Removed the Baseline entry for StubEntityStorageBase as suggested

The PHPStan is now passing, Moving it to NR

Feedback appears to be addressed.

larowlan → closed merge request !10297

Committed to 11.x - thanks!