Remove unused test case

[brandonmichigangithub]

Remove unused and undefined test case.
Fixes hashicorp/terraform-provider-google#20257

[modular-magician]

Hi there, I'm the Modular magician. I've detected the following information about your changes:

Diff report

Your PR generated some diffs in downstreams - here they are.

google provider: Diff ( 1 file changed, 3 deletions(-))
google-beta provider: Diff ( 1 file changed, 3 deletions(-))

[modular-magician]

Tests analytics

Total tests: 26
Passed tests: 25
Skipped tests: 1
Affected tests: 0

Click here to see the affected service packages

• artifactregistry

🟢 All tests passed!

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