ci(perf.yml): use python venv to run gbench result comparison

[ekoops]

What type of PR is this?

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

/kind bug

/kind cleanup

/kind design

/kind documentation

/kind failing-test

/kind test

/kind feature

/kind sync

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:

This PR fixes the issue in https://github.com/falcosecurity/libs/actions/runs/19959292467/job/57236907247 by running gbench result comparison in a separate python virtual environment, and bumping the gbench version to a version newer than 1.9.4 (not released yet, but this is the only way to avoid dependency issues with python 3.12).

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

/milestone 0.23.0

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 77.02%. Comparing base (bcc11cc) to head (0a11138).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2738   +/-   ##
=======================================
  Coverage   77.02%   77.02%           
=======================================
  Files         296      296           
  Lines       30818    30818           
  Branches     4670     4670           
=======================================
  Hits        23738    23738           
  Misses       7080     7080           

Flag	Coverage Δ
libsinsp	77.02% <ø> (ø)

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[github-actions]

Perf diff from master - unit tests

     1.69%     +1.14%  [.] std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_add_ref_lock_nothrow()
     1.94%     -0.73%  [.] std::__shared_count<(__gnu_cxx::_Lock_policy)2>::_M_get_use_count() const
     1.48%     +0.28%  [.] sinsp_threadinfo::get_fd_table()
     5.42%     -0.28%  [.] sinsp::next(sinsp_evt**)
     3.41%     -0.27%  [.] next_event_from_file
     0.43%     +0.27%  [.] sinsp_parser::parse_context_switch(sinsp_evt&)
     2.30%     -0.24%  [.] std::__shared_ptr<sinsp_threadinfo, (__gnu_cxx::_Lock_policy)2>::__shared_ptr(std::__weak_ptr<sinsp_threadinfo, (__gnu_cxx::_Lock_policy)2> const&, std::nothrow_t)
     1.43%     -0.20%  [.] sinsp_parser::process_event(sinsp_evt&, sinsp_parser_verdict&)
     2.03%     -0.20%  [.] sinsp_threadinfo::get_main_thread()
     0.73%     +0.20%  [.] sinsp_evt_param::used_legacy_null_encoding() const

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                                            +0.0234         +0.0233           232           237           232           237
BM_sinsp_split_median                                          +0.0276         +0.0274           231           237           231           237
BM_sinsp_split_stddev                                          -0.7670         -0.7753             3             1             3             1
BM_sinsp_split_cv                                              -0.7724         -0.7804             0             0             0             0
BM_sinsp_concatenate_paths_relative_path_mean                  +0.0471         +0.0472            69            72            69            72
BM_sinsp_concatenate_paths_relative_path_median                +0.0511         +0.0511            69            73            69            73
BM_sinsp_concatenate_paths_relative_path_stddev                +0.1128         +0.1131             1             1             1             1
BM_sinsp_concatenate_paths_relative_path_cv                    +0.0627         +0.0629             0             0             0             0
BM_sinsp_concatenate_paths_empty_path_mean                     +0.0250         +0.0251            44            45            44            45
BM_sinsp_concatenate_paths_empty_path_median                   +0.0262         +0.0265            43            45            43            45
BM_sinsp_concatenate_paths_empty_path_stddev                   -0.7274         -0.7267             2             1             2             1
BM_sinsp_concatenate_paths_empty_path_cv                       -0.7340         -0.7334             0             0             0             0
BM_sinsp_concatenate_paths_absolute_path_mean                  -0.0121         -0.0120            69            68            69            68
BM_sinsp_concatenate_paths_absolute_path_median                +0.0000         -0.0000            68            68            68            68
BM_sinsp_concatenate_paths_absolute_path_stddev                -0.3304         -0.3288             1             1             1             1
BM_sinsp_concatenate_paths_absolute_path_cv                    -0.3223         -0.3206             0             0             0             0