Fix GKE CPA tests so that cluster creation waits for CA creation.

[tonyzhc]

Fixes hashicorp/terraform-provider-google#20961.

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[github-actions]

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[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, 4 insertions(+))
google-beta provider: Diff ( 1 file changed, 4 insertions(+))

[modular-magician]

Tests analytics

Total tests: 225
Passed tests: 214
Skipped tests: 11
Affected tests: 0

Click here to see the affected service packages

• container

🟢 All tests passed!

View the build log

[melinath]

Simple change; looks like the tests are passing