chore: Remove amannn/action-semantic-pull-request workflow

[khvn26]

Summary

• Remove the conventional-commit.yml workflow that used amannn/action-semantic-pull-request
• This check is now handled by the Flagsmith GitHub App webhook handler

🤖 Generated with Claude Code

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.90%. Comparing base (c71c67a) to head (1c93bb0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #170   +/-   ##
=======================================
  Coverage   95.90%   95.90%           
=======================================
  Files          90       90           
  Lines        3051     3051           
=======================================
  Hits         2926     2926           
  Misses        125      125           

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