Support allocated_ip_range in google_sql_database_instance

[modular-magician]

Fix hashicorp/terraform-provider-google#9986
Also bring the test to GA as service networking is available in GA now

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Release Note Template for Downstream PRs (will be copied)

sql: added field `allocated_ip_range` to resource `google_sql_database_instance`

Derived from GoogleCloudPlatform/magic-modules#5500