fix: protect get environment document endpoint

[matthewelwell]

Changes

Ensures that get_document endpoint is correctly protected by permissions.

How did you test this code?

Added a new unit test and updated existing one to ensure that the correct permission check is performed.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Aug 7, 2024 9:18am
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Aug 7, 2024 9:18am
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Aug 7, 2024 9:18am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4459	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4459	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4459	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4459	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4459	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4459	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-55037 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.86%. Comparing base (3225c47) to head (dff0d11).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4459   +/-   ##
=======================================
  Coverage   96.85%   96.86%           
=======================================
  Files        1171     1171           
  Lines       38846    38854    +8     
=======================================
+ Hits        37626    37634    +8     
  Misses       1220     1220           

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