chore: api remove pipedrive

[Zaimwa9]

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

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

Changes

• Cleaned-up pipedrive as not used anymore.
• Removed apps and related code

How did you test this code?

• Backend running
• Typecheck successful
• code pipedrive related eliminated

[vercel[bot]]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Jun 20, 2025 10:02am
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Jun 20, 2025 10:02am
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Jun 20, 2025 10:02am

[github-actions[bot]]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-5626	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-5626	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-5626	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith-api:pr-5626	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith:pr-5626	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5626	Finished :white_check_mark:	Results :white_check_mark:

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.76%. Comparing base (251508a) to head (5bce71f). Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5626      +/-   ##
==========================================
- Coverage   97.76%   97.76%   -0.01%     
==========================================
  Files        1255     1245      -10     
  Lines       44643    44064     -579     
==========================================
- Hits        43645    43078     -567     
+ Misses        998      986      -12     

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