chore: Remove UpdateManagedTrustZoneBundle from TrustZoneClient

[markgoddard]

UpdateTrustZoneBundle now accepts a trust zone ID, and can be used for
both the local and managed trust zones.

[github-actions]

The latest Buf updates on your PR. Results from workflow buf-ci / buf (pull_request).

Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Jul 16, 2025, 11:00 AM

[gemini-code-assist]

Summary of Changes

Hello @markgoddard, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request streamlines the TrustZone bundle update functionality by consolidating two distinct methods, UpdateTrustZoneBundle and UpdateManagedTrustZoneBundle, into a single, more versatile UpdateTrustZoneBundle method. This new method now explicitly accepts a trustZoneID, allowing it to handle updates for both local and managed trust zones uniformly.

Highlights

• API Consolidation: I've merged the UpdateTrustZoneBundle and UpdateManagedTrustZoneBundle methods within the TrustZoneClient interface and its implementation into a single UpdateTrustZoneBundle method.
• Explicit Trust Zone ID: The consolidated UpdateTrustZoneBundle now explicitly requires a trustZoneID as an argument, making its scope clear and removing the implicit agent-ID based bundle updates.
• Simplified Internal Logic: I've removed the getAgentIDFromMetadata helper function and its related google.golang.org/grpc/metadata import, simplifying the internal client logic.
• Enhanced Fake Client Behavior: The fake client's UpdateTrustZoneBundle implementation has been updated to support partial bundle updates, merging X509Authorities, JwtAuthorities, RefreshHint, and SequenceNumber if a bundle for the given trustZoneID already exists.

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[gemini-code-assist]

Code Review

The pull request refactors the TrustZoneClient by merging UpdateTrustZoneBundle and UpdateManagedTrustZoneBundle into a single method. The review includes suggestions to enhance the fake implementation and its tests for better correctness and coverage.