Description

There is an undocumented behavior with Contained DBs like AzureSQL. If you set contained_db to True then you must set a custom root_rotation_statements. This PR ensures we set a default root rotation statement for contained dbs.

TODO only if you're a HashiCorp employee

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  of a public function, even if that change is in a CE file, double check that
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  break any tests. Sometimes ENT only tests rely on public functions in CE
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