feat(compute): Added example for mig standby policy

[askubis]

Description

Fixes #335382497

Note: If you are not associated with Google, open an issue for discussion before submitting a pull request.

Checklist

Readiness

• [x] Yes, merge this PR after it is approved
• [ ] No, don't merge this PR after it is approved

Style

• [x] My sample follows the rules described for Terraform in the Effective Samples style guide
• [x] My sample follows the other requirements and best practices in the Contributing guide

Testing

• [x] I have performed tests described in the Contributing guide:

  • [x] Tests pass: terraform apply
  • [x] Lint pass: terraform fmt check

Intended location

• [x] Yes, this sample will be (or already is) included on cloud.google.com Location(s): https://cloud.google.com/compute/docs/instance-groups/accelerate-mig-scale-out-with-standby-pools#edit_the_standby_policy_in_a_mig

• [ ] No, this sample won't be included on cloud.google.com Reason:

API enablement

• [x] If the sample needs an API enabled to pass testing, I have added the service to the Test setup file

Review

• [x] If this sample adds a new directory, I have added codeowners to the CODEOWNERS file

[snippet-bot[bot]]

Here is the summary of changes.

You are about to add 2 region tags.

- [compute/zonal_mig_standby_policy/main.tf:22](https://github.com/askubis/terraform-docs-samples/blob/1d912338919f954e121a0c15b428758eba40de34/compute/zonal_mig_standby_policy/main.tf#L22), tag `compute_zonal_instance_group_manager_standby_policy_parent_tag` - [compute/zonal_mig_standby_policy/main.tf:36](https://github.com/askubis/terraform-docs-samples/blob/1d912338919f954e121a0c15b428758eba40de34/compute/zonal_mig_standby_policy/main.tf#L36), tag `compute_zonal_instance_group_manager_standby_policy_tag`

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[msampathkumar]

/gcbrun

[msampathkumar]

/gcbrun