Add comment to GoogleProviderConfig test util function

[SarahFrench]

I'm currently diving though acc test / VCR test code and thought this function could do with a comment to distinguish it from the VCR-specific code.

Release Note Template for Downstream PRs (will be copied)

[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 insertions(+))
google-beta provider: Diff ( 1 file changed, 3 insertions(+))

[zli82016]

LGTM. Thanks for adding the comment.

[modular-magician]

Tests analytics

Total tests: 3628
Passed tests: 3260
Skipped tests: 366
Affected tests: 2

Click here to see the affected service packages

all service packages are affected

Action taken

Found 2 affected test(s) by replaying old test recordings. Starting RECORDING based on the most recent commit. Click here to see the affected tests

TestAccComputeRegionPerInstanceConfig_removeInstanceOnDestroy|TestAccHealthcareDatasetIamPolicy

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[modular-magician]

$\textcolor{green}{\textsf{Tests passed during RECORDING mode:}}$
TestAccComputeRegionPerInstanceConfig_removeInstanceOnDestroy[Debug log]
TestAccHealthcareDatasetIamPolicy[Debug log]

$\textcolor{green}{\textsf{No issues found for passed tests after REPLAYING rerun.}}$

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$\textcolor{green}{\textsf{All tests passed!}}$
View the build log or the debug log for each test