feat: introduce the WorkloadIdentity component

[Hectorhammett]

PiperOrigin-RevId: 962846928

[snippet-bot]

Here is the summary of changes.

You are about to add 3 region tags.

• WorkloadIdentity/samples/V1/WorkloadIdentityClient/generate_service_agents.php:25, tag workloadidentity_v1_generated_WorkloadIdentity_GenerateServiceAgents_sync
• WorkloadIdentity/samples/V1/WorkloadIdentityClient/get_location.php:25, tag workloadidentity_v1_generated_WorkloadIdentity_GetLocation_sync
• WorkloadIdentity/samples/V1/WorkloadIdentityClient/list_locations.php:25, tag workloadidentity_v1_generated_WorkloadIdentity_ListLocations_sync

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