feat(reddit)!: remove deprecated praw auth flow

[ReenigneArcher]

Description

Removes deprecated auth flow for praw/reddit bot.

Screenshot

Issues Fixed or Closed

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Dependency update (updates to dependencies)
• Documentation update (changes to documentation)
• Repository update (changes to repository files, e.g. .github/...)

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have added or updated the in code docstring/documentation-blocks for new or existing methods/components

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.16%. Comparing base (8468697) to head (0fdb4ce).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #377      +/-   ##
==========================================
+ Coverage   67.26%   70.16%   +2.90%     
==========================================
  Files          21       20       -1     
  Lines        1112     1066      -46     
==========================================
  Hits          748      748              
+ Misses        364      318      -46