wait for completion on otel

[sfc-gh-pdharmana]

Description

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included in the release announcement. Please also include relevant motivation
and context.

Other details good to know for developers

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Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to
  not work as expected)
• New Tests
• This change includes re-generated golden test results
• This change requires a documentation update

---

Important

Adds wait_for_completion method in App to ensure OTEL operations complete, integrated into start in run.py.

• Behavior:
  • Adds wait_for_completion(timeout: float = 60.0) -> bool in App in app.py to wait for all operations to complete with OTEL tracing.
  • Integrates wait_for_completion in start() in run.py to ensure app operations complete after invocation.
• Error Handling:
  • Raises RuntimeError in wait_for_completion if OTEL tracing is not enabled.
  • Logs a warning in start() if wait_for_completion fails or times out.
• Misc:
  • Adds logging in start() in run.py to indicate waiting for app operations.

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