feat(forgejo): cache org teams in policy check

[theakshaypant]

📝 Description of the Change

Cache ListOrgTeams API responses per organization to avoid redundant API calls when checking policy for the same org across multiple allowed teams evaluations.

🔗 Linked GitHub Issue

N/A

🧪 Testing Strategy

• Unit tests
• Integration tests
• End-to-end tests
• Manual testing
• Not Applicable

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[gemini-code-assist]

Code Review

This pull request introduces caching for organization teams in the Gitea provider to prevent redundant API calls, extracting the logic into a new listOrgTeams helper method and adding a unit test to verify the caching behavior. However, a critical issue was identified in listOrgTeams where accessing resp.StatusCode before checking if err is nil or if resp is nil could lead to a nil pointer dereference panic.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.11%. Comparing base (9fb79c7) to head (10d7201).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2775      +/-   ##
==========================================
+ Coverage   60.09%   60.11%   +0.01%     
==========================================
  Files         210      210              
  Lines       21135    21145      +10     
==========================================
+ Hits        12701    12711      +10     
  Misses       7641     7641              
  Partials      793      793              

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