fix: with_cleared_baggage

[gabotechs]

Fixes with_cleared_baggage method in opentelemtry::Context. Without this change, the function is just not clearing the baggage as the new empty baggage is not being wrapped with the appropriate BaggageContextValue

Changes

• wraps the Baggage struct with a BaggageContextValue in the with_cleared_baggage method
• adds a unit test that fails on main but succeeds in this branch

Merge requirement checklist

• CONTRIBUTING guidelines followed
• Unit tests added/updated (if applicable)
• N/A Appropriate CHANGELOG.md files updated for non-trivial, user-facing changes
• N/A Changes in public API reviewed (if applicable)

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: gabotechs / name: Gabriel (8fa1f7b)
• ✅ login: cijothomas / name: Cijo Thomas (9801db6)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.0%. Comparing base (cab5565) to head (9801db6).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #3006   +/-   ##
=====================================
  Coverage   80.9%   81.0%           
=====================================
  Files        126     126           
  Lines      24803   24821   +18     
=====================================
+ Hits       20088   20109   +21     
+ Misses      4715    4712    -3     

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[paullegranddc]

LGTM