feat(cloud_sql): add ssl_mode to PostgreSQL example

[feng-zhe]

Description

Fixes #310700535

Checklist

Readiness

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

Style

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

Testing

• I have performed tests described in the Contributing guide: https://paste.googleplex.com/6576073727279104?raw

  • Tests pass: terraform apply
  • Lint pass: terraform fmt check

Intended location

• Yes, this sample will be (or already is) included on cloud.google.com
  Location(s):

• 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

[msampathkumar]

/gcbrun

[msampathkumar]

@feng-zhe - Thank you for sharing testing logs

[msampathkumar]

/gcbrun

[feng-zhe]

Hi @msampathkumar, thanks for reviewing the change. I saw the above
terraform-docs-samples-int-trigger (cloud-foundation-cicd) failed with --- FAIL: TestSamples/2/sqlserver_instance_private_ip (603.18s). I feel my change should not impact it. Please advice. Thanks.

[msampathkumar]

Hi @msampathkumar, thanks for reviewing the change. I saw the above terraform-docs-samples-int-trigger (cloud-foundation-cicd) failed with --- FAIL: TestSamples/2/sqlserver_instance_private_ip (603.18s). I feel my change should not impact it. Please advice. Thanks.

Sorry for the trouble. The CICD is the process of being upgraded and we would have wait for it be completed or this bug to cleared up.

[msampathkumar]

/gcbrun

[feng-zhe]

Thanks @msampathkumar! Somehow the CICD still fails and I cannot find anything related to this change.

Update: I saw it says my branch is outdated from main. So I just clicked the "update branch" button. Hope it helps. Thanks.

[feng-zhe]

Hi @msampathkumar , any updates? Please let me know what I should to make the CICD errors go away. Thanks.

[msampathkumar]

/gcbrun

[feng-zhe]

Thanks, I've changed it to POSTGRES_14.

[feng-zhe]

Hi @msampathkumar, just a friendly ping. Thanks.

[msampathkumar]

/gcbrun

[msampathkumar]

Error:

Step #5 - "test-samples-2": TestSamples/2/sqlserver_instance_private_ip 2023-12-15T13:27:57Z command.go:185: Error: Unable to remove Service Networking Connection, err: Error waiting for Delete Service Networking Connection: Error code 9, message: Failed to delete connection; Producer services (e.g. CloudSQL, Cloud Memstore, etc.) are still using this connection.

[msampathkumar]

I will be doing for manual testing for approval.

[msampathkumar]

Manually tested. LGTM.