compute: forced recreation of google_compute_security_policy on type updates

[modular-magician]

Updating the type of google_compute_security_policy (e.g., from CLOUD_ARMOR to CLOUD_ARMOR_EDGE) requires the resource to be recreated.

Fixes #20071

Without the change (and without the plancheck), verified that this test fails.

    resource_compute_security_policy_test.go:43: Step 3/4 error: Check failed: Check 1/1 error: google_compute_security_policy.policy: Attribute 'type' expected "CLOUD_ARMOR_EDGE", got "CLOUD_ARMOR"
--- FAIL: TestAccComputeSecurityPolicy_basicUpdate (41.37s)

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compute: fixed permadiff on attempted `type` field updates in `google_computer_security_policy`, updating this field will now force recreation of the resource

Derived from GoogleCloudPlatform/magic-modules#12233

[github-actions]

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