feat: Set base url for segment

[zachaysan]

Changes

Introduce a change to the host parameter of the Segment client in order to support non-default regions. Also includes a migration to set existing segment clients to the default host via the base_url field of the configuration model.

How did you test this code?

Altered existing tests.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 10, 2024 1:12pm
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flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 10, 2024 1:12pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4684	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4684	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4684	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4684	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4684	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-56856 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.21%. Comparing base (d0a6caf) to head (a9688fa).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4684   +/-   ##
=======================================
  Coverage   97.21%   97.21%           
=======================================
  Files        1171     1173    +2     
  Lines       40651    40670   +19     
=======================================
+ Hits        39517    39537   +20     
+ Misses       1134     1133    -1     

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