refactor: exposing CommitConflictError enum

[Filip-Dziuba]

TransactionError::CommitConflict exposes private CommitConflictError.
Cleaner access to Commit Conflict, allowing handling it in match for metrics/logging/error handling.

[alexwilcoxson-rel]

Thanks @Filip-Dziuba !

@ion-elgreco @rtyler as Filip mentions we don't have a way to match on why commits conflict. With this we can improve our conflict handling.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.51%. Comparing base (5d10cbe) to head (973ee8e).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2907      +/-   ##
==========================================
+ Coverage   72.48%   72.51%   +0.02%     
==========================================
  Files         131      131              
  Lines       40421    40421              
  Branches    40421    40421              
==========================================
+ Hits        29300    29311      +11     
  Misses       9238     9238              
+ Partials     1883     1872      -11     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.