[New Resource] Support for Assured Workloads

[acpana]

This PR adds support for the AssuredWorkloadsWorkload resource in Config Connector using the direct controller pattern.

It includes:

• Direct controller implementation for AssuredWorkloadsWorkload.
• Updated KRM types and regenerated mappers.
• MockGCP service implementation for Assured Workloads.
• E2E test fixture for basic workload creation and update.

Fixes #6650.

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[google-oss-prow]

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[acpana]

I have addressed the issues and cleaned up the PR history.

Key changes:

• Rebased on master to clean up the diff (removed unrelated generated files).
• Fixed the AssuredWorkloadsWorkload implementation which was incomplete and used non-existent helper functions.
• Added missing OrganizationRef and Location fields to the Spec.
• Implemented AssuredWorkloadsWorkloadIdentity and GetIdentity method.
• Refactored the controller to use standard direct controller patterns (common.CompareProtoMessage, common.BasicDiff).
• Implemented AdapterForURL and fixed Export in the controller.
• Fixed a bug in MockGCP normalization for Assured Workloads.

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