Added region tags for inclusion on cgc cloud SQL docs

[modular-magician]

Added region tags for inclusion on the following pages:

https://cloud.google.com/sql/docs/sqlserver/create-manage-databases#create https://cloud.google.com/sql/docs/postgres/create-manage-databases#create https://cloud.google.com/sql/docs/mysql/create-manage-databases#create

Derived from GoogleCloudPlatform/magic-modules#5749

[github-actions]

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