initial fix

[maxi-cit]

Fixes: hashicorp/terraform-provider-google#18793

Fixes an issue regarding GKE Resource Manager Tags which was causing in-place update due to not handling null values properly

Release Note Template for Downstream PRs (will be copied)

container: fixed update inconsistency in `google_container_cluster`

[github-actions]

Hello! I am a robot. Tests will require approval from a repository maintainer to run.

@BBBmau, a repository maintainer, has been assigned to review your changes. If you have not received review feedback within 2 business days, please leave a comment on this PR asking them to take a look.

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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 ( 2 files changed, 11 insertions(+), 2 deletions(-))
google-beta provider: Diff ( 2 files changed, 11 insertions(+), 2 deletions(-))

[modular-magician]

Tests analytics

Total tests: 200
Passed tests: 190
Skipped tests: 10
Affected tests: 0

Click here to see the affected service packages

• container

$\textcolor{green}{\textsf{All tests passed!}}$

View the build log

[github-actions]

@BBBmau This PR has been waiting for review for 3 weekdays. Please take a look! Use the label disable-review-reminders to disable these notifications.

[BBBmau]

looks good, thanks for adding these checks!