Add deletion_protection field to Metastore Service

[SamanthaMathews]

Add deletion_protection field to make deletion actions require an explicit intent
Part of b/366197455

Part of hashicorp/terraform-provider-google#18854

Release Note Template for Downstream PRs (will be copied)

Metastore: added `deletion_protection` field to `dataproc_metastore_service` to make deleting them require an explicit intent. `google_active_directory_domain` resources now cannot be destroyed unless `deletion_protection = false` is set for the resource.

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