feat(cloud_sql): Add ipv6 PSC endpoint examples for Cloud SQL PSC instances

[loeng2023]

Description

Fixes #379913163

Checklist

Readiness

• Yes, 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/mysql/configure-private-service-connect
  • https://cloud.google.com/sql/docs/postgres/configure-private-service-connect
  • https://cloud.google.com/sql/docs/sqlserver/configure-private-service-connect

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• cloud_sql/mysql_instance_psc/main.tf:64, tag cloud_sql_mysql_instance_ipv6_psc_endpoint
• cloud_sql/postgres_instance_psc/main.tf:63, tag cloud_sql_postgres_instance_ipv6_psc_endpoint
• cloud_sql/sqlserver_instance_psc/main.tf:65, tag cloud_sql_sqlserver_instance_ipv6_psc_endpoint

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