feat(cloud_sql): add MCP instances examples

[xuebaoZ]

Description

Fixes #

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

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:

  • 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): https://cloud.google.com/sql/docs/postgres/managed-connection-pooling

• 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 8 region tags.

• cloud_sql/mysql_instance_managed_connection_pooling/main.tf:17, tag cloud_sql_mysql_instance_managed_connection_pooling_creation
• cloud_sql/mysql_instance_managed_connection_pooling/main.tf:35, tag cloud_sql_mysql_instance_managed_connection_pooling_enable
• cloud_sql/mysql_instance_managed_connection_pooling/main.tf:53, tag cloud_sql_mysql_instance_managed_connection_pooling_modify
• cloud_sql/mysql_instance_managed_connection_pooling/main.tf:75, tag cloud_sql_mysql_instance_managed_connection_pooling_disable
• cloud_sql/postgres_instance_managed_connection_pooling/main.tf:17, tag cloud_sql_postgres_instance_managed_connection_pooling_creation
• cloud_sql/postgres_instance_managed_connection_pooling/main.tf:34, tag cloud_sql_postgres_instance_managed_connection_pooling_enable
• cloud_sql/postgres_instance_managed_connection_pooling/main.tf:51, tag cloud_sql_postgres_instance_managed_connection_pooling_modify
• cloud_sql/postgres_instance_managed_connection_pooling/main.tf:72, tag cloud_sql_postgres_instance_managed_connection_pooling_disable

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[NimJay]

/gcbrun

[glasnt]

/gcbrun

[glasnt]

/gcbrun