Remove unused get_cleaning_parameters function

[aaguasca]

This PR removes the unused function get_cleaning_parameters from find_safe_threshold_from_dl1_file

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (fd7e1a8) 74.46% compared to head (0ebe771) 73.98%.
Report is 301 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1170      +/-   ##
==========================================
- Coverage   74.46%   73.98%   -0.49%     
==========================================
  Files         124      124              
  Lines       12211    12645     +434     
==========================================
+ Hits         9093     9355     +262     
- Misses       3118     3290     +172     

Files	Coverage Δ
...stchain/calib/camera/pixel_threshold_estimation.py	27.27% <ø> (-0.99%)	⬇️

... and 57 files with indirect coverage changes

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[morcuended]

This can be merged as well.