Notebook instances output tags by default

[bcreddy-gcp]

fixes hashicorp/terraform-provider-google#17075

Release Note Template for Downstream PRs (will be copied)

notebooks: changed `tag` field to default to the API's value if not specified in `google_notebooks_instance` 

[github-actions]

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

@c2thorn, 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.

You can help make sure that review is quick by doing a self-review and by running impacted tests locally.

[c2thorn]

/gcbrun

[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.

Terraform GA: Diff ( 1 file changed, 1 insertion(+))
Terraform Beta: Diff ( 1 file changed, 1 insertion(+))

[modular-magician]

Tests analytics

Total tests: 24
Passed tests: 24
Skipped tests: 0
Affected tests: 0

Click here to see the affected service packages

• notebooks

$\textcolor{green}{\textsf{All tests passed!}}$
View the build log