Migrate ComputeURLMap to Direct controller - generate type

[codebot-robot]

Migrate the ComputeURLMap resource to use the Direct controller architecture.

This PR adds the generated types, identity, and reference for ComputeURLMap in the compute v1beta1 API. It also updates the generate.sh script and generates the initial mappers.

Key changes:

• Updated apis/compute/v1beta1/generate.sh to include ComputeURLMap.
• Created apis/compute/v1beta1/urlmap_identity.go to support both Global and Regional URL Maps.
• Created apis/compute/v1beta1/urlmap_reference.go.
• Populated apis/compute/v1beta1/urlmap_types.go with fields mapped from the proto.
• Generated mappers in pkg/controller/direct/compute/mapper.generated.go.

Fixes #6438

This PR was generated by the gemini-3-flash-preview model.

[google-oss-prow]

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[codebot-robot]

I have addressed the validation failures by registering the new ComputeURLMap resource as a direct controller while keeping Terraform as the default reconciler. This follows the standard KCC migration pattern, ensuring no breakage for existing users while enabling the new generated types and supporting opt-in testing for the direct controller.

Key changes:

• Created a skeleton direct controller in .
• Added the and methods to .
• Added the exported function to .
• Added the label to the Go struct to ensure it remains Terraform-managed by default.
• Regenerated all supporting files (, , CRDs, and resource reports) to be consistent with the changes.

[codebot-robot]

I have addressed the validation failures by registering the new ComputeURLMap resource as a direct controller while keeping Terraform as the default reconciler. This follows the standard KCC migration pattern, ensuring no breakage for existing users while enabling the new generated types and supporting opt-in testing for the direct controller.

Key changes:

• Created a skeleton direct controller in pkg/controller/direct/compute/urlmap_controller.go.
• Added the NewUrlMapsClient and NewRegionalUrlMapsClient methods to pkg/controller/direct/compute/client.go.
• Added the NewComputeURLMapIdentity exported function to apis/compute/v1beta1/urlmap_identity.go.
• Added the tf2crd: "true" label to the ComputeURLMap Go struct to ensure it remains Terraform-managed by default.
• Regenerated all supporting files (static_config.go, gvks_generated.go, CRDs, and resource reports) to be consistent with the changes.