feat(environment): Add toggle for identity override in local eval

[gagantrivedi]

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| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **docs** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/docs/HjmV6Z6DSUom2tSYMNP7jmN1ut3V)) | [Visit Preview](https://docs-git-feat-identity-override-toggle-flagsmith.vercel.app) | | Sep 4, 2024 10:00am | | **flagsmith-frontend-preview** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/flagsmith-frontend-preview/7fYxNwDt53ja2kUxgWdWpSjjGNJ8)) | [Visit Preview](https://flagsmith-frontend-preview-git-feat-identity-o-b5edd0-flagsmith.vercel.app) | | Sep 4, 2024 10:00am | | **flagsmith-frontend-staging** | ⬜️ Ignored ([Inspect](https://vercel.com/flagsmith/flagsmith-frontend-staging/6HDJhUehftQjTqQix8Bxx7hMoEfW)) | [Visit Preview](https://flagsmith-frontend-staging-git-feat-identity-o-41ae94-flagsmith.vercel.app) | | Sep 4, 2024 10:00am |

[sentry-io[bot]]

🔍 Existing Issues For Review

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

📄 File: api/util/mappers/engine.py

Function	Unhandled Issue
map_environment_to_engine	ValidationError: 1 validation error for FeatureStateModel util.mappers.engine in map_featurestate... Event Count: 1

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Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4576	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4576	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4576	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith-api:pr-4576	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith:pr-4576	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4576	Finished :white_check_mark:	Results :white_check_mark:

[github-actions[bot]]

Uffizzi Preview deployment-55861 was deleted.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.14%. Comparing base (8e371a8) to head (bb764e7). Report is 7 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #4576 +/- ## ======================================= Coverage 97.14% 97.14% ======================================= Files 1154 1155 +1 Lines 39816 39838 +22 ======================================= + Hits 38679 38701 +22 Misses 1137 1137 ```

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