Cleanup unused AbstractDialogFragment

[shobhitagarwal1612]

All existing dialog fragments have been migrated to compose screens.

@andreia-ferreira PTAL?

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.71%. Comparing base (809e729) to head (e8f6dc0).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3657      +/-   ##
============================================
+ Coverage     66.45%   66.71%   +0.26%     
  Complexity     1629     1629              
============================================
  Files           363      362       -1     
  Lines          8979     8944      -35     
  Branches       1154     1154              
============================================
  Hits           5967     5967              
+ Misses         2360     2325      -35     
  Partials        652      652              

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