Revert "add process cpu measurement node and tests (#40)"

[thomas-moulard]

This reverts commit 46b4453.

[codecov]

Codecov Report

Merging #48 into master will increase coverage by 1.27%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master     #48      +/-   ##
=========================================
+ Coverage   40.42%   41.7%   +1.27%     
=========================================
  Files          31      28       -3     
  Lines        1128     880     -248     
  Branches      665     506     -159     
=========================================
- Hits          456     367      -89     
+ Misses         69      52      -17     
+ Partials      603     461     -142

Flag	Coverage Δ
#unittests	41.7% <ø> (+1.27%)	⬆️

Impacted Files	Coverage Δ
...tor/src/system_metrics_collector/proc_cpu_data.cpp	56.52% <ø> (+1.68%)	⬆️
...r/test/system_metrics_collector/test_utilities.cpp	14.89% <ø> (-5.42%)	⬇️
...r/test/system_metrics_collector/test_utilities.hpp	25% <ø> (+5%)	⬆️
...llector/src/system_metrics_collector/utilities.cpp	33.8% <ø> (+0.14%)	⬆️
...tor/src/system_metrics_collector/proc_cpu_data.hpp	66.66% <ø> (-16.67%)	⬇️

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