[PM-30542] Remove Milestone 11 feature flag

[lastbestdev]

🎟️ Tracking

https://bitwarden.atlassian.net/browse/PM-30542

📔 Objective

Removes the constant for milestone 11 feature flag from backend.

📸 Screenshots

N/A

[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

[github-actions]

Checkmarx One – Scan Summary & Details – 92578a3c-af6d-49f4-8ee8-965632ea6828

Great job! No new security vulnerabilities introduced in this pull request

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.62%. Comparing base (a7259df) to head (96893b7).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7243   +/-   ##
=======================================
  Coverage   57.62%   57.62%           
=======================================
  Files        2032     2032           
  Lines       89517    89517           
  Branches     7974     7974           
=======================================
+ Hits        51587    51588    +1     
+ Misses      36071    36070    -1     
  Partials     1859     1859           

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