fix: Set project change requests url

[zachaysan]

Changes

The frontend uses the singular project for URLs, so this updates to what our emails around change requests for projects have in them.

How did you test this code?

Updated a model unit test.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Dec 13, 2024 4:35pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Dec 13, 2024 4:35pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Dec 13, 2024 4:35pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4920	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4920	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4920	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4920	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4920	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4920	Finished ✅	Results ✅

[github-actions]

Uffizzi Ephemeral Environment deployment-59101

☁️ https://app.uffizzi.com/github.com/Flagsmith/flagsmith/pull/4920

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.39%. Comparing base (5d02ab1) to head (1ee6082).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4920   +/-   ##
=======================================
  Coverage   97.39%   97.39%           
=======================================
  Files        1190     1190           
  Lines       41530    41530           
=======================================
  Hits        40448    40448           
  Misses       1082     1082           

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