Fix OTLP handling of identity content-encoding

[jack-berg]

Resolves the issue noted by @jackshirazi here: #8224 (comment)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.28%. Comparing base (2e385f8) to head (1df2067).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #8277   +/-   ##
=========================================
  Coverage     90.28%   90.28%           
- Complexity     7683     7685    +2     
=========================================
  Files           850      850           
  Lines         23182    23186    +4     
  Branches       2348     2352    +4     
=========================================
+ Hits          20929    20933    +4     
  Misses         1529     1529           
  Partials        724      724           

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