Refine error messages for OTelSdkError variants

[lalitb]

Fixes #
Design discussion issue (if applicable) #

Changes

Please provide a brief description of the changes here.

Merge requirement checklist

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

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.2%. Comparing base (d481be5) to head (3822d57).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2608   +/-   ##
=====================================
  Coverage   79.2%   79.2%           
=====================================
  Files        118     118           
  Lines      22511   22511           
=====================================
  Hits       17829   17829           
  Misses      4682    4682           

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