[PM-34809] Remove feature flag for policy drawers from server

[JaredScar]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-34809

📔 Objective

Removes feature flag from enum on server-side for policy drawers

[github-actions]

🤖 Bitwarden Claude Code Review

Overall Assessment: APPROVE

This PR removes the PolicyDrawers feature flag constant (pm-34804-policy-drawers) from FeatureFlagKeys in src/Core/Constants.cs. A repository-wide search confirms no remaining references to either the constant or the flag key string, so nothing breaks from the removal. No findings.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 63.89%. Comparing base (38eaee5) to head (433d303).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8188   +/-   ##
=======================================
  Coverage   63.89%   63.89%           
=======================================
  Files        2359     2359           
  Lines      102319   102319           
  Branches     9240     9240           
=======================================
  Hits        65378    65378           
  Misses      34714    34714           
  Partials     2227     2227           

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