feat: backend-clone-segments

[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?
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Changes

This PR implements the backend cloning/duplication of segments

• New CloneSegmentSerializer, requiring a name and performing the duplication
• New endpoint /api/v1/projects/{projectId}/segments/{segmentId}/clone/ accepting a (required) name as body payload
• Metadata new method deep_clone_for_new_entity, taking an entity (segment/env/feature) to deep clone and create the related new metadata

How did you test this code?

• New tests
• Postman requests
• Fullstack branch feat/clone-segments-and-feature-segments

Project Segment creation
https://www.loom.com/share/27ec8d4a2d8d4c24b443ac5d2b12231e?focus_title=1&muted=1&from_recorder=1

Feature specific segment creation
https://www.loom.com/share/8cc4d8e92ce84c459dfb6598ebb42acb

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
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flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Apr 28, 2025 10:16am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5393	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-5393	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-5393	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-5393	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5393	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5393	Finished ✅	Results ✅

[github-actions]

Uffizzi Ephemeral Environment deployment-63156

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.62%. Comparing base (8dc92c3) to head (682fd2b).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #5393    +/-   ##
========================================
  Coverage   97.61%   97.62%            
========================================
  Files        1237     1238     +1     
  Lines       42975    43075   +100     
========================================
+ Hits        41952    42052   +100     
  Misses       1023     1023            

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