[Backend] Add SAML option to get email from attribute (#8536)

[richard-julien]

See #8536

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 6 lines in your changes missing coverage. Please review.

Project coverage is 66.42%. Comparing base (9754a5e) to head (7f263c4).
Report is 18 commits behind head on master.

Files with missing lines	Patch %	Lines
...i-platform/opencti-graphql/src/config/providers.js	0.00%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #8537      +/-   ##
==========================================
+ Coverage   66.21%   66.42%   +0.20%     
==========================================
  Files         597      597              
  Lines       60417    60549     +132     
  Branches     6205     6447     +242     
==========================================
+ Hits        40008    40221     +213     
+ Misses      20409    20328      -81     

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[aHenryJard]

Tested locally with a SAML/keycloak working as expected. All good !

[aHenryJard]

linked to OpenCTI-Platform/docs#213