fix: ensure MANAGE_TAGS permission allows create tag

[matthewelwell]

Changes

Fixes an issue found in testing #4615 where it was not possible to create a tag when a user had the MANAGE_TAGS permission.

How did you test this code?

Added new tests to confirm both negative and positive cases.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Oct 1, 2024 2:36pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Oct 1, 2024 2:36pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Oct 1, 2024 2:36pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4678	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4678	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-4678	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4678	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-4678	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4678	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-56808 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.19%. Comparing base (59aa2f7) to head (99ce47b).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4678   +/-   ##
=======================================
  Coverage   97.19%   97.19%           
=======================================
  Files        1166     1166           
  Lines       40436    40447   +11     
=======================================
+ Hits        39301    39312   +11     
  Misses       1135     1135           

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