fix: use-query-from-workflow-list-change-request

[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!
• 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

Scheduled changes calculation was solely relying on feature states while real use case is based on change requests (and depending on environment versioning).

Reworked the calculation by using the query used in flagsmith-workflows GET list-change-requests as to count exactly the records that would be shown in scheduled changes page

How did you test this code?

• Created scheduled changes and verified the count
• Reworked the tests

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Jun 13, 2025 8:11am
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Jun 13, 2025 8:11am
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Jun 13, 2025 8:11am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-5568	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-5568	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-5568	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-5568	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-5568	Finished ✅	Results ✅

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.69%. Comparing base (c1eed05) to head (90cfc8b).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5568   +/-   ##
=======================================
  Coverage   97.69%   97.69%           
=======================================
  Files        1247     1247           
  Lines       44249    44253    +4     
=======================================
+ Hits        43231    43235    +4     
  Misses       1018     1018           

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