chore: import upstream snapshot with attribution

docs/en/integrations/cloud-sql-mssql/prebuilt-configs/cloud-sql-for-sql-server.md

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+---
+title: "Cloud SQL for SQL Server"
+type: docs
+description: "Details of the Cloud SQL for SQL Server prebuilt configuration."
+---
+
+## Cloud SQL for SQL Server
+
+*   `--prebuilt` value: `cloud-sql-mssql`
+*   **Environment Variables:**
+    *   `CLOUD_SQL_MSSQL_PROJECT`: The GCP project ID.
+    *   `CLOUD_SQL_MSSQL_REGION`: The region of your Cloud SQL instance.
+    *   `CLOUD_SQL_MSSQL_INSTANCE`: The ID of your Cloud SQL instance.
+    *   `CLOUD_SQL_MSSQL_DATABASE`: The name of the database to connect to.
+    *   `CLOUD_SQL_MSSQL_USER`: The database username.
+    *   `CLOUD_SQL_MSSQL_PASSWORD`: The password for the database user.
+    *   `CLOUD_SQL_MSSQL_IP_TYPE`: (Optional) The IP type i.e. "Public" or
+        "Private" (Default: Public).
+*   **Permissions:**
+    *   **Cloud SQL Client** (`roles/cloudsql.client`) to connect to the
+        instance.
+    *   Database-level permissions (e.g., `SELECT`, `INSERT`) are required to
+        execute queries.
+*   **Tools:**
+    *   `execute_sql`: Executes a SQL query.
+    *   `list_tables`: Lists tables in the database.