fix: LEAP-1997: make CORS configurable via env

[jombooth]

see Configuration: https://pypi.org/project/django-cors-headers/

confirmed that

curl -i 'https://fb-leap-1997-configurable.appx.humansignal.com/api/current-user/whoami' [REDACTED] 'Origin: https://example.org'

will include

access-control-allow-origin: https://example.org

in its returned headers, if https://example.org is set as one of the CORS_ALLOWED_ORIGINS.

This also adds origin header logging to the LS nginx config.

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[codecov]

Codecov Report

Attention: Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 77.79%. Comparing base (59feca7) to head (5494fc5).
Report is 1 commits behind head on develop.

Files with missing lines	Patch %	Lines
label_studio/core/settings/base.py	60.00%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #7448      +/-   ##
===========================================
- Coverage    77.80%   77.79%   -0.01%     
===========================================
  Files          195      195              
  Lines        15768    15772       +4     
===========================================
+ Hits         12268    12270       +2     
- Misses        3500     3502       +2     

Flag	Coverage Δ
pytests	77.79% <60.00%> (-0.01%)	⬇️

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[jombooth]

/git merge develop

Workflow run
Successfully merged: delete mode 100644 web/dist/libs/editor/version.json

[jombooth]

/git merge develop

Workflow run
Successfully merged: Already up to date.

[jombooth]

/git merge develop

Workflow run
Successfully merged: 1 file changed, 2 insertions(+)

[jombooth]

/git merge develop

Workflow run
Successfully merged: Already up to date.