TST: Print the CP2K .out and .err files whenever a test job crashes

[BvB93]

Print the last 100 lines of the .err and .out file whenever a test job crashes.

[codecov]

Codecov Report

Merging #281 (08050d6) into master (bced01b) will decrease coverage by 0.18%.
The diff coverage is 67.85%.

@@            Coverage Diff             @@
##           master     #281      +/-   ##
==========================================
- Coverage   82.11%   81.93%   -0.19%     
==========================================
  Files          41       41              
  Lines        2142     2170      +28     
  Branches      359      368       +9     
==========================================
+ Hits         1759     1778      +19     
- Misses        299      301       +2     
- Partials       84       91       +7     

Impacted Files	Coverage Δ
src/qmflows/packages/SCM.py	65.18% <ø> (ø)
src/qmflows/packages/packages.py	85.34% <ø> (ø)
src/qmflows/test_utils.py	89.88% <67.85%> (-10.12%)	⬇️

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