Implement DL2 integration tests

[HealthyPear]

Requirements for merging

• Merge PR Improve models generation #96

Description

Through this PR we implement a set of 3 integration tests for DL2 (1 per particle type).

Probably 1 could have been sufficient, but they are relatively fast, using about <~10 shower each.

[codecov]

Codecov Report

Merging #126 (9f1427f) into master (61722f9) will increase coverage by 11.37%.
The diff coverage is 100.00%.

❗ Current head 9f1427f differs from pull request most recent head 294b850. Consider uploading reports for the commit 294b850 to get more accurate results

@@             Coverage Diff             @@
##           master     #126       +/-   ##
===========================================
+ Coverage   48.93%   60.30%   +11.37%     
===========================================
  Files          23       23               
  Lines        2058     2091       +33     
===========================================
+ Hits         1007     1261      +254     
+ Misses       1051      830      -221     

Impacted Files	Coverage Δ
protopipe/scripts/tests/test_pipeline.py	100.00% <100.00%> (ø)
protopipe/scripts/write_dl2.py	82.45% <0.00%> (+77.54%)	⬆️

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