feat: Add customersuccess@flagsmith.com to cc for API usage notifications

[matthewelwell]

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Changes

Resolves #7081

How did you test this code?

Updated unit tests

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored		Apr 7, 2026 5:03pm
flagsmith-frontend-preview	Ignored		Apr 7, 2026 5:03pm
flagsmith-frontend-staging	Ignored		Apr 7, 2026 5:03pm

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.34%. Comparing base (6bf055c) to head (1b19711).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7157      +/-   ##
==========================================
+ Coverage   98.27%   98.34%   +0.07%     
==========================================
  Files        1336     1336              
  Lines       50047    50209     +162     
==========================================
+ Hits        49182    49379     +197     
+ Misses        865      830      -35     

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