feat: Switch existing task processor health checks to new liveness probe

[khvn26]

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Changes

This accommodates for changes introduced in Flagsmith/flagsmith-task-processor#25 by intercepting python manage.py checktaskprocessorthreadhealth command and redirecting it to new liveness probe introduced in #5151.

How did you test this code?

Ran python manage.py checktaskprocessorthreadhealth and made sure the correct HTTP call is made.

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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5161	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-5161	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-5161	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-5161	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5161	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5161	Finished ✅	Results ✅

[github-actions]

Uffizzi Ephemeral Environment deployment-61312

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/5161

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.49%. Comparing base (9a58249) to head (ce4c15c).
Report is 9 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5161      +/-   ##
==========================================
+ Coverage   97.47%   97.49%   +0.02%     
==========================================
  Files        1224     1223       -1     
  Lines       42590    42581       -9     
==========================================
+ Hits        41515    41516       +1     
+ Misses       1075     1065      -10     

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[rolodato]

Can we add a deprecation warning when this is being used? In case we need to troubleshoot other customer deployments that have similar issues, this could tell us immediately if they are using the old style healthchecks or not.

I understand this code is only ever called by Docker Compose healthchecks, which should be removed.

Otherwise LGTM 👍

[khvn26]

Done.

[rolodato]

@khvn26 Added 236df86 to remove healthchecks from Docker Compose, and bake them directly into the Dockerfile. I understand this should only be used automatically by Compose, and not ECS, Kubernetes or other orchestrators.

[khvn26]

In 121128e, I added support for the new Task processor endpoint that now accepts command line arguments for Gunicorn as well. This enables HTTP healthchecks directly on Task processor containers.

We'll need to merge Flagsmith/flagsmith-task-processor#25 and change the dependency reference before we merge this.

I also refreshed documentation related to Task processor operation.