fix(export): fixes issue exporting identity feature states with missing attributes

[matthewelwell]

Changes

This fixes a bug found in the export process for old identities that have overrides with missing "feature_state_value".

How did you test this code?

Updated existing unit test.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Jan 10, 2025 11:51am
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Jan 10, 2025 11:51am
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Jan 10, 2025 11:51am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4987	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4987	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4987	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4987	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4987	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4987	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4987	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4987	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4987	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-59760 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.39%. Comparing base (2fe4e02) to head (c068349).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4987   +/-   ##
=======================================
  Coverage   97.39%   97.39%           
=======================================
  Files        1191     1191           
  Lines       41630    41633    +3     
=======================================
+ Hits        40546    40549    +3     
  Misses       1084     1084           

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