[PM-38209] Remove pm-26961-access-intelligence-trend-chart feature flag

[lastbestdev]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-38209

📔 Objective

Unwind the pm-26961-access-intelligence-trend-chart feature flag (DIRT team), following the Feature Flags Lifecycle documentation.

The flag's FeatureFlagKeys.AccessIntelligenceTrendChart constant was defined in src/Core/Constants.cs but had no other references in the server codebase, so removal is limited to deleting the constant declaration.

📸 Screenshots

N/A — no UI changes.

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

This PR unwinds the pm-26961-access-intelligence-trend-chart feature flag by removing the FeatureFlagKeys.AccessIntelligenceTrendChart constant from src/Core/Constants.cs. I verified there are no remaining references to the constant or the flag string pm-26961-access-intelligence-trend-chart anywhere in the codebase, so the removal is complete and consistent with the documented Feature Flags Lifecycle. No security, correctness, or breaking-change concerns identified.

Code Review Details

No findings. Clean feature flag unwind.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.23%. Comparing base (408002d) to head (e383d03).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7840   +/-   ##
=======================================
  Coverage   61.23%   61.23%           
=======================================
  Files        2209     2209           
  Lines       97743    97743           
  Branches     8815     8815           
=======================================
  Hits        59849    59849           
  Misses      35770    35770           
  Partials     2124     2124           

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