Apply CALIB_SCALE directly from ctapipe.io.SimtelEventSource

[HealthyPear]

This PR basically implements what is currently pending in cta-observatory/ctapipe#1749

[codecov]

Codecov Report

Merging #145 (d871baf) into master (513e1ca) will increase coverage by 1.23%.
The diff coverage is 98.71%.

@@            Coverage Diff             @@
##           master     #145      +/-   ##
==========================================
+ Coverage   65.69%   66.93%   +1.23%     
==========================================
  Files          23       23              
  Lines        2169     2238      +69     
==========================================
+ Hits         1425     1498      +73     
+ Misses        744      740       -4     

Impacted Files	Coverage Δ
protopipe/pipeline/temp.py	89.62% <98.46%> (+8.20%)	⬆️
protopipe/pipeline/event_preparer.py	65.96% <100.00%> (+1.08%)	⬆️
protopipe/scripts/data_training.py	93.05% <100.00%> (+0.13%)	⬆️
protopipe/scripts/write_dl2.py	81.96% <100.00%> (+0.23%)	⬆️

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