feat: add group admin to list groups

[matthewelwell]

Changes

Adds the group_admin attribute to each user returned when listing groups for an organisation.

See here and here.

How did you test this code?

Added a new test.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Oct 29, 2024 10:32am
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Oct 29, 2024 10:32am
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Oct 29, 2024 10:32am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4779	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4779	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4779	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4779	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4779	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4779	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-57722 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.30%. Comparing base (56a266d) to head (55b9880).
Report is 8 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4779   +/-   ##
=======================================
  Coverage   97.30%   97.30%           
=======================================
  Files        1174     1174           
  Lines       40846    40878   +32     
=======================================
+ Hits        39744    39776   +32     
  Misses       1102     1102           

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