chore(ci): disable unstable scap-related perf test from perf PR comment and check

[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:

It disables the flaky scap-related perf test; moreover, it avoids polluting PRs with perf-related bot comments, instead editing existing one.

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

     8.16%     -1.29%  [.] sinsp::next
     3.07%     -1.08%  [.] libsinsp::sinsp_suppress::process_event
     0.60%     +0.64%  [.] std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >::_M_construct<char*>
     3.51%     +0.61%  [.] gzfile_read
     0.45%     +0.60%  [.] sinsp_parser::event_cleanup
     2.49%     -0.53%  [.] std::_Sp_counted_base<(__gnu_cxx::_Lock_policy)2>::_M_release
     1.51%     -0.52%  [.] sinsp_parser::parse_context_switch
     4.19%     -0.50%  [.] sinsp_parser::process_event
     0.83%     +0.50%  [.] libsinsp::events::is_unknown_event
     4.47%     +0.45%  [.] next

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

[Molter73]

/lgtm

[poiana]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: FedeDP, Molter73

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.15%. Comparing base (7b72eb5) to head (f144484).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2017   +/-   ##
=======================================
  Coverage   74.14%   74.15%           
=======================================
  Files         253      253           
  Lines       30834    30834           
  Branches     5405     5406    +1     
=======================================
+ Hits        22863    22864    +1     
+ Misses       7965     7951   -14     
- Partials        6       19   +13     

Flag	Coverage Δ
libsinsp	74.15% <ø> (+<0.01%)	⬆️

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