feat: Return transient traits explicitly

[khvn26]

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

• I have run pre-commit to check linting
• 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

As discussed offline, this makes the /api/v1/identities SDK route return transient traits explicitly. This helps simplify SDK caching logic — i.e. see this commit to JS SDK.

Contributes to #4278.

How did you test this code?

Modified an existing unit test.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Jul 24, 2024 9:49am
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Jul 24, 2024 9:49am
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Jul 24, 2024 9:49am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-4375	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-e2e:pr-4375	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4375	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4375	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4375	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4375	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-54537 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.81%. Comparing base (f1cc8d8) to head (e3371b4).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4375   +/-   ##
=======================================
  Coverage   96.81%   96.81%           
=======================================
  Files        1165     1165           
  Lines       38508    38525   +17     
=======================================
+ Hits        37281    37298   +17     
  Misses       1227     1227           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.