feat: Distinct liveness probe

[khvn26]

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Changes

This decouples the /health/liveness endpoint from the get_version_info view as discussed here.

How did you test this code?

Added a unit test.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Mar 12, 2025 0:20am
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Mar 12, 2025 0:20am
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Mar 12, 2025 0:20am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-5221	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-5221	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-5221	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-5221	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5221	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5221	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-61814 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.51%. Comparing base (d57f903) to head (82a18dd).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5221   +/-   ##
=======================================
  Coverage   97.51%   97.51%           
=======================================
  Files        1227     1228    +1     
  Lines       42619    42626    +7     
=======================================
+ Hits        41559    41566    +7     
  Misses       1060     1060           

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