contained_db DeleteUser unit test (#13895)
contained_db DeleteUser unit test (#13895)

* added TestDeleteUserContainedDB | testContainedDBCredsExist helper function

* unit test contained db sanitization

Co-authored-by: Gary Frederick <36b55be54a588d8a573e164535d758abf4650af0@protonmail.com>
rnaveiras/vault,hashicorp/vault,rnaveiras/vault,hashicorp/vault,rnaveiras/vault,rnaveiras/vault,hashicorp/vault,rnaveiras/vault,hashicorp/vault,hashicorp/vault,hashicorp/vault