Add propagate_unsampled field to trace config #38223
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Commit Message: add propagate_unsampled field to trace config
Additional Description:
This PR prevents Span implementations from modifying the existing trace context by not constructing them if propagate_unsampled=true
Risk Level: Medium
Testing: Unit tests
Docs Changes: inline in proto
Release Notes: Added
Platform Specific Features: N/A
Fixes #38222