feat: add option to disable secure cookies (WIP)

[matthewelwell]

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

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

Changes

Adds an environment variable to disable using secure cookies. This is to be used for deployments inside a private network without a domain / ssl cert.

How did you test this code?

Manually updated project.js to have useSecureCookies: false and ran flagsmith locally, but navigated to it using my local IP, not localhost / 127.0.0.1. Note: this test failed, hence WIP / draft.

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Name	Status	Preview	Comments	Updated (UTC)
docs	🛑 Canceled (Inspect)			Feb 26, 2024 5:49pm
flagsmith-frontend-preview	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 26, 2024 5:49pm
flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 26, 2024 5:49pm

[github-actions[bot]]

Uffizzi Preview deployment-46906 was deleted.

[codecov-commenter]

Codecov Report

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

Project coverage is 95.91%. Comparing base (a4f2d64) to head (9ebe844).

:exclamation: Current head 9ebe844 differs from pull request most recent head 75344d7. Consider uploading reports for the commit 75344d7 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3441   +/-   ##
=======================================
  Coverage   95.91%   95.91%           
=======================================
  Files        1092     1092           
  Lines       34003    34005    +2     
=======================================
+ Hits        32613    32615    +2     
  Misses       1390     1390           

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