Moved ulimit

[Valkyrie00]

Moved wrapper and setup of ulimit in a specific file and changed some logics to improve tests.

[codecov]

Codecov Report

Merging #147 (55ed670) into main (f59f690) will decrease coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
- Coverage   80.19%   80.18%   -0.02%     
==========================================
  Files          86       87       +1     
  Lines        5191     5193       +2     
==========================================
+ Hits         4163     4164       +1     
- Misses       1028     1029       +1     

Impacted Files	Coverage Δ
src/program.c	27.64% <0.00%> (-3.45%)	⬇️
src/program_ulimit.c	69.56% <69.56%> (ø)

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