Investigate potential race condition in GRPC unit test

[akihikokuroda]

Bug Report

Investigate the potential race condition in GRPC unit test discussed in #2521

What did you do?
Unit test (pkg/controllers/registry/grpc/source_test.go) failure might be caused by the potential race condition.

What did you expect to see?
No failure

What did you see instead? Under which circumstances?
Unit test failure in pkg/controllers/registry/grpc/source_test.go

Environment

• operator-lifecycle-manager version:

• Kubernetes version information:

• Kubernetes cluster kind:

Possible Solution

Additional context
Add any other context about the problem here.

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