chore: add data manager tests

[freak12techno]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 76.59574% with 11 lines in your changes missing coverage. Please review.

Project coverage is 45.19%. Comparing base (7e0e16e) to head (2b6fcd4).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/app_manager.go	0.00%	9 Missing ⚠️
pkg/converter/converter.go	50.00%	1 Missing ⚠️
pkg/populators/slashing_params_populator.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #74      +/-   ##
==========================================
+ Coverage   40.23%   45.19%   +4.95%     
==========================================
  Files          78       78              
  Lines        4071     4045      -26     
==========================================
+ Hits         1638     1828     +190     
+ Misses       2418     2196     -222     
- Partials       15       21       +6     

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