fix: deduplicate metrics live features states

[Zaimwa9]

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• I have added information to docs/ if required so people know about the feature!
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• I have filled in the "How did you test this code" section below?
• I have used a Conventional Commit title for this Pull Request

Changes

Reported metrics were incorrect on long-lived environment (with feature-versioning). This PR deduplicates the feature-states from the feature (Total features/Features enabled/Segment override) and adapted identity_overrides count with dynamoDB

How did you test this code?

• Added tests
• Tested SQL queries against prod to eliminate duplication

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Jun 16, 2025 2:58pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Jun 16, 2025 2:58pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Jun 16, 2025 2:58pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5571	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-5571	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-5571	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-5571	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5571	Finished ✅	Results ✅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.69%. Comparing base (68f6847) to head (319c290).
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5571      +/-   ##
==========================================
- Coverage   97.70%   97.69%   -0.01%     
==========================================
  Files        1248     1248              
  Lines       44270    44287      +17     
==========================================
+ Hits        43252    43268      +16     
- Misses       1018     1019       +1     

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