feat: Log environment IDs in SDK endpoints

[khvn26]

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• I have added information to docs/ if required so people know about the feature!
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Changes

In this PR, we use functionality added by Flagsmith/flagsmith-common#55 to log environment IDs in SDK endpoints.

The resolved environment ID can be aded by adding %{flagsmith.environment_id}e to ACCESS_LOG_FORMAT, or setting ACCESS_LOG_JSON_EXTRA_ITEMS to "{flagsmith.environment_id}e" for surfacing it in JSON access logs.

How did you test this code?

Ran Core API locally and curl localhost:8000/api/v1/environment-document/ -H 'X-Environment-Key: <locally created server API key>':

ACCESS_LOG_EXTRA_ITEMS='{flagsmith.environment_id}e' LOG_FORMAT=json ACCESS_LOG_LOCATION=- make serve
poetry run flagsmith start --reload api
{"levelname": "INFO", "message": "Starting gunicorn 23.0.0", "timestamp": "2025-04-21 22:02:12,436", "logger_name": "gunicorn.error", "pid": 17755, "thread_name": "MainThread"}
{"levelname": "INFO", "message": "Listening at: http://0.0.0.0:8000 (17755)", "timestamp": "2025-04-21 22:02:12,436", "logger_name": "gunicorn.error", "pid": 17755, "thread_name": "MainThread"}
{"levelname": "INFO", "message": "Using worker: sync", "timestamp": "2025-04-21 22:02:12,436", "logger_name": "gunicorn.error", "pid": 17755, "thread_name": "MainThread"}
{"levelname": "INFO", "message": "Booting worker with pid: 18117", "timestamp": "2025-04-21 22:02:12,443", "logger_name": "gunicorn.error", "pid": 18117, "thread_name": "MainThread"}
{"levelname": "INFO", "message": "127.0.0.1 - - [21/Apr/2025:22:02:16 +0000] \"GET /api/v1/environment-document/ HTTP/1.1\" 200 805 \"-\" \"curl/8.7.1\" - -", "timestamp": "2025-04-21 22:02:16,961", "logger_name": "gunicorn.access", "pid": 18117, "thread_name": "MainThread", "time": "2025-04-21T22:02:16+00:00", "path": "/api/v1/environment-document/", "remote_ip": "127.0.0.1", "route": "/api/v1/environment-document/", "method": "GET", "status": "200", "user_agent": "curl/8.7.1", "duration_in_ms": 56, "response_size_in_bytes": 805, "environ_variables": {"flagsmith.environment_id": 1}}

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Docker builds report

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ghcr.io/flagsmith/flagsmith-api:pr-5365	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-5365	Finished ✅	Results ✅
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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.61%. Comparing base (4b0ae75) to head (50b5e83).
Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5365   +/-   ##
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  Coverage   97.61%   97.61%           
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  Files        1237     1237           
  Lines       42971    42974    +3     
=======================================
+ Hits        41948    41951    +3     
  Misses       1023     1023           

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