revert(obs): remove sgp-obs beta changes

[stephen-wang24]

Summary

• revert feat(obs): wire sgp-obs from the SDK for traces, metrics and logs #518 from next so the observability work does not enter the normal main release yet
• keep feat(tracing): stamp __commit_sha__ automatically when AGENT_COMMIT_SHA is set #507 and feat(registration): report the agent's commit and source repo at registration #508 unchanged
• continue testing feat(obs): wire sgp-obs from the SDK for traces, metrics and logs #518 independently through the 0.27.0b1 beta branch in chore(release): prepare 0.27.0b2 with the sgp-obs log-duplication fix #521

Validation

• verified the resulting tree exactly matches next immediately before feat(obs): wire sgp-obs from the SDK for traces, metrics and logs #518
• uv run ruff check .
• uv run pyright -p .
• uv run pytest (1692 passed, 1622 skipped)
• uv build --all-packages --wheel

After this merges, keep #520 in draft until Stainless refreshes it and confirm the #518 changes are no longer included.

Confidence Score: 5/5

The PR appears safe to merge.

Summary

This PR reverts the observability beta work from the normal release while keeping the earlier tracing changes in place. It removes sgp-obs setup, GenAI metrics, shutdown flushing, private package-index support, and related logging handover from the SDK and generated agent images.

• Removes optional observability wiring from ACP servers and Temporal workers.
• Removes LiteLLM GenAI metric recording and related shutdown hooks.
• Removes private package-index support from generated Dockerfiles.
• Restores OpenAI Agents scaffolds to disabled native tracing.

Diagram

sequenceDiagram
    participant U as User
    participant A as ACP server
    participant T as Temporal
    participant W as Worker
    participant P as Tracing processors
    participant B as Trace backend

    Note over A,W: No automatic sgp-obs setup
    U->>A: Send ACP request
    A->>A: Attach incoming W3C trace context
    A->>T: Start workflow or send signal
    T->>W: Run workflow and activities
    W->>P: Send business span events
    P->>B: Export configured spans
    U->>A: Stop service
    A->>P: Drain default async span queue
    Note over A,W: No sgp-obs or manager-wide sync drain

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