Remove beta fields from the google provider

[modular-magician]

Part of #8696

We don't need to remove RIGM manager.DistributionPolicy.TargetShape as it has since GA'ed

If this PR is for Terraform, I acknowledge that I have:

• Searched through the issue tracker for an open issue that this either resolves or contributes to, commented on it to claim it, and written "fixes {url}" or "part of {url}" in this PR description. If there were no relevant open issues, I opened one and commented that I would like to work on it (not necessary for very small changes).
• Generated Terraform, and ran make test and make lint to ensure it passes unit and linter tests.
• Ensured that all new fields I added that can be set by a user appear in at least one example (for generated resources) or third_party test (for handwritten resources or update tests).
• Ran relevant acceptance tests (If the acceptance tests do not yet pass or you are unable to run them, please let your reviewer know).
• Read the Release Notes Guide before writing my release note below.

Release Note Template for Downstream PRs (will be copied)

compute: removed the `update_policy.min_ready_sec` field from `google_compute_instance_group_manager`, `google_compute_region_instance_group_manager` in the GA provider

compute: removed the `enable_display` field from `google_compute_instance_template` in the GA provider

container: removed the `pod_security_policy_config` field from `google_container_cluster` in the GA provider

container: removed the `workload_identity_config.0.identity_namespace` field from `google_container_cluster`, use `workload_identity_config.0.workload_pool` instead

runtimeconfig: removed the Runtime Configurator service from the `google` (GA) provider including `google_runtimeconfig_config`, `google_runtimeconfig_variable`, `google_runtimeconfig_config_iam_policy`, `google_runtimeconfig_config_iam_binding`, `google_runtimeconfig_config_iam_member`, `data.google_runtimeconfig_config`. They are only available in the `google-beta` provider, as the underlying service is in beta.

Derived from GoogleCloudPlatform/magic-modules#5262

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