fix(ci): only account for mean values in google benchmarks perf CI checks

[FedeDP]

What type of PR is this?

/kind cleanup

Any specific area of the project related to this PR?

/area CI

Does this PR require a change in the driver versions?

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[FedeDP]

/milestone 0.18.0

[github-actions]

Perf diff from master - unit tests

     6.54%     -0.94%  [.] next
     1.59%     +0.83%  [.] sinsp::fetch_next_event
     3.05%     +0.65%  [.] gzfile_read
     4.46%     -0.59%  [.] sinsp_evt::load_params
     0.98%     -0.55%  [.] libsinsp::runc::match_container_id
     3.10%     -0.55%  [.] sinsp_thread_manager::get_thread_ref
     4.68%     -0.54%  [.] sinsp_parser::process_event
     0.93%     +0.50%  [.] sinsp_evt::get_direction
     7.24%     -0.47%  [.] sinsp::next
     9.09%     +0.47%  [.] sinsp_parser::reset

Heap diff from master - unit tests

peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

Heap diff from master - scap file

peak heap memory consumption: 0B
peak RSS (including heaptrack overhead): 0B
total memory leaked: 0B

Benchmarks diff from master

Comparing gbench_data.json to /root/actions-runner/_work/libs/libs/build/gbench_data.json
Benchmark                                                         Time             CPU      Time Old      Time New       CPU Old       CPU New
----------------------------------------------------------------------------------------------------------------------------------------------
BM_sinsp_split_mean                                            -0.0047         -0.0046           149           148           149           148
BM_sinsp_split_median                                          -0.0060         -0.0058           149           148           149           148
BM_sinsp_split_stddev                                          +0.4914         +0.5042             0             1             0             1
BM_sinsp_split_cv                                              +0.4984         +0.5111             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_mean                  -0.0263         -0.0262            42            41            42            41
BM_sinsp_concatenate_paths_relative_path_median                -0.0195         -0.0194            42            41            42            41
BM_sinsp_concatenate_paths_relative_path_stddev                -0.8695         -0.8694             1             0             1             0
BM_sinsp_concatenate_paths_relative_path_cv                    -0.8660         -0.8659             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_mean                     +0.0090         +0.0092            17            17            17            17
BM_sinsp_concatenate_paths_empty_path_median                   +0.0077         +0.0077            17            17            17            17
BM_sinsp_concatenate_paths_empty_path_stddev                   +0.1163         +0.1188             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_cv                       +0.1063         +0.1087             0             0             0             0
BM_sinsp_concatenate_paths_absolute_path_mean                  -0.1395         -0.1394            49            43            49            43
BM_sinsp_concatenate_paths_absolute_path_median                -0.1400         -0.1399            50            43            50            43
BM_sinsp_concatenate_paths_absolute_path_stddev                -0.3539         -0.3573             0             0             0             0
BM_sinsp_concatenate_paths_absolute_path_cv                    -0.2492         -0.2532             0             0             0             0
BM_sinsp_split_container_image_mean                            -0.0117         -0.0115           354           350           354           350
BM_sinsp_split_container_image_median                          -0.0141         -0.0140           354           349           354           349
BM_sinsp_split_container_image_stddev                          +0.1076         +0.1090             2             3             2             3
BM_sinsp_split_container_image_cv                              +0.1207         +0.1219             0             0             0             0

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.21%. Comparing base (89edd36) to head (d2f25fd).
Report is 19 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2030   +/-   ##
=======================================
  Coverage   74.20%   74.21%           
=======================================
  Files         253      253           
  Lines       30832    30832           
  Branches     5394     5396    +2     
=======================================
+ Hits        22880    22881    +1     
+ Misses       7934     7927    -7     
- Partials       18       24    +6     

Flag	Coverage Δ
libsinsp	74.21% <ø> (+<0.01%)	⬆️

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[FedeDP]

Cleanup: no need to test the build of benchmarks in normal CI now that they run in perf CI.

[Andreagit97]

/approve

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

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