add support for Cloud Armor Edge Policies

[modular-magician]

closes #10761

Release Note Template for Downstream PRs (will be copied)

compute: added support for field `type` to `google_compute_security_policy`

compute: added support for attaching a `edge_security_policy` to `google_compute_backend_bucket`

Derived from GoogleCloudPlatform/magic-modules#5794

[github-actions]

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