enable RE2 support by default on linux

[blotus]

Enable the use of RE2 by default for GROK patterns on linux.

The re2_grok_support feature flag is now deprecated only on linux.

The re2_disable_grok_support feature flag is available only on linux to force switching off the use of RE2 in case of issues.

[github-actions]

@blotus: There are no 'kind' label on this PR. You need a 'kind' label to generate the release automatically.

• /kind feature
• /kind enhancement
• /kind refactoring
• /kind fix
• /kind chore
• /kind dependencies

Details

I am a bot created to help the crowdsecurity developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.

[github-actions]

@blotus: There are no area labels on this PR. You can add as many areas as you see fit.

• /area agent
• /area local-api
• /area cscli
• /area appsec
• /area security
• /area configuration

Details

I am a bot created to help the crowdsecurity developers manage community feedback and contributions. You can check out my manifest file to understand my behavior and what I can do. If you want to use this for your project, you can check out the BirthdayResearch/oss-governance-bot repository.

[blotus]

/kind enhancement
/area agent

[codecov]

Codecov Report

❌ Patch coverage is 35.71429% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.13%. Comparing base (30ca8b2) to head (82fc614).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/fflag/crowdsec.go	20.00%	1 Missing and 7 partials ⚠️
pkg/parser/unix_parser.go	75.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4386      +/-   ##
==========================================
- Coverage   63.14%   63.13%   -0.01%     
==========================================
  Files         475      475              
  Lines       33669    33670       +1     
==========================================
  Hits        21259    21259              
  Misses      10288    10288              
- Partials     2122     2123       +1     

Flag	Coverage Δ
bats	46.47% <28.57%> (+<0.01%)	⬆️
unit-linux	36.19% <14.28%> (-0.02%)	⬇️
unit-windows	24.72% <7.14%> (+0.01%)	⬆️

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