chore: Remove heap, mixpanel, zendesk and dynatrace

[kyle-ssg]

Thanks for submitting a PR! Please check the boxes below:

• I have added information to docs/ if required so people know about the feature!
• I have filled in the "Changes" section below?
• 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

• Removes mixpanel, heap, zendesk and Dynatrace
• Creates reusable function for tracking traits

How did you test this code?

• Validated mixpanel / heap were no longer used
• Validated traits were still sent correctly to amplitude

[vercel]

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1 Skipped Deployment

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[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith:pr-5802	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5802	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api-test:pr-5802	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-5802	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-5802	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5802	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5802	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-5802	Finished ✅	Results ✅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.82%. Comparing base (d06acd3) to head (3d3060a).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5802   +/-   ##
=======================================
  Coverage   97.81%   97.82%           
=======================================
  Files        1257     1257           
  Lines       44675    44700   +25     
=======================================
+ Hits        43701    43726   +25     
  Misses        974      974           

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[khvn26]

LGTM 👍