Fix respecting case of groups and organizations in header provider

[sbocahu]

Proposed changes

• Respect case of headers for groups & organizations mapping of users automaticaly authenticated by proxy headers (authentication 'header' provider)

Related issues

• Authentication header provider does not support HTTP/1.1 style headers with capital letters #5591

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality

Further comments

untested; however it seems to be straightforward

[codecov]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (2e21cd8) 66.12% compared to head (ee8ff5f) 66.11%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
...i-platform/opencti-graphql/src/config/providers.js	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5664      +/-   ##
==========================================
- Coverage   66.12%   66.11%   -0.01%     
==========================================
  Files         512      512              
  Lines       60429    60429              
  Branches     4407     4406       -1     
==========================================
- Hits        39956    39952       -4     
- Misses      20473    20477       +4     

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[richard-julien]

Thanks be already fix by c8125ab