[10kartik]

Adds the three "conflicting packages during Docker migration" endpoints:

• OrganizationsService.ListDockerMigrationConflictingPackages - GET /orgs/{org}/docker/conflicts
• UsersService.ListDockerMigrationConflictingPackages - GET /user/docker/conflicts and GET /users/{username}/docker/conflicts

The users method follows UsersService.ListPackages: an empty user means the authenticated user. None of these endpoints take pagination parameters, so there are no Iter methods.

I used Claude Code to help write this and reviewed every line myself.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.64%. Comparing base (dac8c26) to head (54bf276).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #4706   +/-   ##
=======================================
  Coverage   98.64%   98.64%           
=======================================
  Files         204      204           
  Lines       19080    19101   +21     
=======================================
+ Hits        18822    18843   +21     
  Misses        258      258           

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