fix: ensure feature segments are cloned correctly

[matthewelwell]

Changes

Currently feature segments are generated for the new environment... but not used at all. This PR ensures that feature segments are cloned correctly and used on the resultant feature states.

How did you test this code?

Updated / added unit tests.

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 30, 2023 2:30pm
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flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 30, 2023 2:30pm

[github-actions]

Uffizzi Preview deployment-34766 was deleted.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (5b46cc0) 95.47% compared to head (3357ee0) 95.47%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2706   +/-   ##
=======================================
  Coverage   95.47%   95.47%           
=======================================
  Files         986      986           
  Lines       27709    27729   +20     
=======================================
+ Hits        26454    26474   +20     
  Misses       1255     1255           

Files Changed	Coverage Δ
api/environments/models.py	95.36% <ø> (-0.05%)	⬇️
api/features/models.py	93.60% <100.00%> (+0.01%)	⬆️
api/tests/integration/conftest.py	100.00% <100.00%> (ø)
...integration/environments/test_clone_environment.py	100.00% <100.00%> (ø)
...i/tests/unit/features/test_unit_features_models.py	100.00% <100.00%> (ø)

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[khvn26]

Approved with optional comments