fix(views/features): use get_environment_flags_list

[gagantrivedi]

Thanks for submitting a PR! Please check the boxes below:

• I have added information to docs/ if required so people know about the feature!
• I have filled in the "Changes" section below?
• I have filled in the "How did you test this code" section below?
• I have used a Conventional Commit title for this Pull Request

Changes

• Replace get_live_feature_states with get_environment_flags_list

Why: get_live_feature_states doesn't take live_from into account when returning feature states, which can result in feature states with less recent live_from values being returned.

How did you test this code?

Covered by updated unit test

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Aug 19, 2024 1:08pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Aug 19, 2024 1:08pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Aug 19, 2024 1:08pm

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: api/features/views.py

Function	Unhandled Issue
get_queryset	ValueError: invalid literal for int() with base 10: 'undefined' /api/v1/environments/{environment_api_key}... Event Count: 147

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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4511	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4511	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4511	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4511	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4511	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4511	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-55348 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.92%. Comparing base (174d437) to head (fe4f0cb).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4511      +/-   ##
==========================================
- Coverage   96.92%   96.92%   -0.01%     
==========================================
  Files        1178     1178              
  Lines       39490    39489       -1     
==========================================
- Hits        38276    38275       -1     
  Misses       1214     1214              

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