fix(tests): flaky thread pool tests

[mrgian]

What type of PR is this?

Uncomment one (or more) /kind <> lines:

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind feature

Any specific area of the project related to this PR?

Uncomment one (or more) /area <> lines:

/area API-version

/area build

/area CI

/area driver-kmod

/area driver-bpf

/area driver-modern-bpf

/area libscap-engine-bpf

/area libscap-engine-gvisor

/area libscap-engine-kmod

/area libscap-engine-modern-bpf

/area libscap-engine-nodriver

/area libscap-engine-noop

/area libscap-engine-source-plugin

/area libscap-engine-savefile

/area libscap

/area libpman

/area libsinsp

/area tests

/area proposals

Does this PR require a change in the driver versions?

/version driver-API-version-major

/version driver-API-version-minor

/version driver-API-version-patch

/version driver-SCHEMA-version-major

/version driver-SCHEMA-version-minor

/version driver-SCHEMA-version-patch

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

[poiana]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 73.58%. Comparing base (73bcad2) to head (7d28df8).
Report is 3 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2071   +/-   ##
=======================================
  Coverage   73.58%   73.58%           
=======================================
  Files         253      253           
  Lines       31869    31869           
  Branches     5654     5628   -26     
=======================================
+ Hits        23451    23452    +1     
+ Misses       8418     8387   -31     
- Partials        0       30   +30     

Flag	Coverage Δ
libsinsp	73.58% <ø> (+<0.01%)	⬆️

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[github-actions]

Perf diff from master - unit tests

     9.08%     +1.62%  [.] sinsp_parser::reset
     8.87%     -1.41%  [.] sinsp::next
     1.18%     +0.94%  [.] std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release
     5.35%     +0.79%  [.] next
     4.37%     -0.70%  [.] sinsp_parser::process_event
     1.37%     +0.65%  [.] std::_Hashtable<long, std::pair<long const, std::shared_ptr<sinsp_threadinfo> >, std::allocator<std::pair<long const, std::shared_ptr<sinsp_threadinfo> > >, std::__detail::_Select1st, std::equal_to<long>, std::hash<long>, std::__detail::_Mod_range_hashing, std::__detail::_Default_ranged_hash, std::__detail::_Prime_rehash_policy, std::__detail::_Hashtable_traits<false, false, true> >::_M_find_before_node
     0.93%     +0.59%  [.] sinsp_evt::get_ts
     0.60%     +0.48%  [.] sinsp_filter_check::parse_field_name
     1.91%     -0.47%  [.] std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char const*>
     0.33%     +0.45%  [.] thread_group_info::get_first_thread

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                                            +0.0132         +0.0132           147           149           147           149
BM_sinsp_split_median                                          +0.0144         +0.0144           147           149           147           149
BM_sinsp_split_stddev                                          -0.2151         -0.2146             0             0             0             0
BM_sinsp_split_cv                                              -0.2253         -0.2249             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_mean                  -0.0006         -0.0006            57            57            57            57
BM_sinsp_concatenate_paths_relative_path_median                +0.0005         +0.0005            57            57            57            57
BM_sinsp_concatenate_paths_relative_path_stddev                +0.2171         +0.2170             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_cv                    +0.2177         +0.2177             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_mean                     -0.0375         -0.0375            25            24            25            24
BM_sinsp_concatenate_paths_empty_path_median                   -0.0307         -0.0307            25            24            25            24
BM_sinsp_concatenate_paths_empty_path_stddev                   -0.8338         -0.8337             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_cv                       -0.8273         -0.8273             0             0             0             0
BM_sinsp_concatenate_paths_absolute_path_mean                  -0.0038         -0.0038            57            56            57            56
BM_sinsp_concatenate_paths_absolute_path_median                -0.0024         -0.0024            56            56            56            56
BM_sinsp_concatenate_paths_absolute_path_stddev                -0.3247         -0.3245             1             0             1             0
BM_sinsp_concatenate_paths_absolute_path_cv                    -0.3221         -0.3219             0             0             0             0
BM_sinsp_split_container_image_mean                            -0.0023         -0.0023           402           401           402           401
BM_sinsp_split_container_image_median                          -0.0035         -0.0035           403           401           403           401
BM_sinsp_split_container_image_stddev                          -0.3724         -0.3727             3             2             3             2
BM_sinsp_split_container_image_cv                              -0.3709         -0.3713             0             0             0             0

[FedeDP]

/milestone TBD