fix(observ): correct rejected items and update comment style

[yumosx]

• correct rejected items in TestInstrumentationExportLogPartialErrors
• fmt imports and update comment style

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.2%. Comparing base (86e673c) to head (2413a79).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #7502   +/-   ##
=====================================
  Coverage   86.2%   86.2%           
=====================================
  Files        295     295           
  Lines      25864   25864           
=====================================
+ Hits       22307   22308    +1     
  Misses      3184    3184           
+ Partials     373     372    -1     

Files with missing lines	Coverage Δ
...log/otlploggrpc/internal/observ/instrumentation.go	99.4% <100.0%> (ø)

... and 3 files with indirect coverage changes

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