feat(cloud_sql): Add samples for SQL Server Advanced DR switchover

[seviet]

Description

Fixes #

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/sql/docs/sqlserver/replication/create-replica#cascadable-replica-steps-sqlserver
https://cloud.google.com/sql/docs/sqlserver/use-advanced-disaster-recovery

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

API enablement

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

Review

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

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• cloud_sql/sqlserver_instance_switchover/create_dr_replica/main.tf:17, tag cloud_sql_sqlserver_instance_create_dr_replica
• cloud_sql/sqlserver_instance_switchover/switchover_begin/main.tf:17, tag cloud_sql_sqlserver_instance_switchover_begin
• cloud_sql/sqlserver_instance_switchover/switchover_finish/main.tf:17, tag cloud_sql_sqlserver_instance_switchover_finish

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[glasnt]

/gcbrun

[seviet]

/gcbrun

Can you run again? Sorry I must have run before adding the test.yaml

[glasnt]

To match the other database version switchover samples, this PR looks okay. You might find when you integrate these samples into the docs you might want to make some changes to the code, to nicely present the mulitple edits required in the resources during the switchover. We can address those when needed.

The only change I've suggested here is around CI workarounds that are not needed since these samples skip apply validation.

[glasnt]

/gcbrun