Mark VerifyEntityIntegrityActionTest as a medium test
Mark VerifyEntityIntegrityActionTest as a medium test

It was timing out occasionally in the Bazel build on less-powerful hardware.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=132378555

google/nomulus,google/nomulus,google/nomulus,google/nomulus,google/nomulus,google/nomulus