Dabonnie/fix cpu measurement test

[dabonnie]

Closes #83

Blocked by #101

Uses the work in #100 in order to refactor Linux CPU measurement tests

Signed-off-by: Devin Bonnie dbbonnie@amazon.com

[dabonnie]

Marking as draft until sufficient test repeats are accomplished. Currently running via
./test_linux_cpu_measurement_node --gtest_repeat=-1 --gtest_break_on_failure

[codecov]

Codecov Report

Merging #102 into master will decrease coverage by 0.07%.
The diff coverage is 16.39%.

@@            Coverage Diff             @@
##           master     #102      +/-   ##
==========================================
- Coverage   39.33%   39.26%   -0.08%     
==========================================
  Files          37       37              
  Lines        1482     1444      -38     
  Branches      890      869      -21     
==========================================
- Hits          583      567      -16     
  Misses         70       70              
+ Partials      829      807      -22

Flag	Coverage Δ
#unittests	39.26% <16.39%> (-0.08%)	⬇️

Impacted Files	Coverage Δ
...r/test/system_metrics_collector/test_functions.hpp	50.87% <ø> (ø)	⬆️
...lector/test_linux_process_cpu_measurement_node.cpp	35.89% <0%> (ø)	⬆️
...m_metrics_collector/test_linux_cpu_measurement.cpp	18.42% <16.36%> (-5.93%)	⬇️
...etrics_collector/test_linux_memory_measurement.cpp	20.86% <20%> (ø)	⬆️

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[dabonnie]

1200 repeated tests and no failures