[PM-7029] Remove key-rotation-feature-flag

[trmartin4]

Type of change

- [ ] Bug fix
- [ ] New feature development
- [X] Tech debt (refactoring, code cleanup, dependency upgrades, etc)
- [ ] Build/deploy pipeline (DevOps)
- [ ] Other

Objective

Removed the key-rotation-feature-flag from clients code.

This was causing #8453 for self-hosted customers with the flag off. Rather than try to fix the issue, I elected to remove the flag as the feature has already been enabled.

See corresponding server PR: bitwarden/server#4002

Before you submit

• Please add unit tests where it makes sense to do so (encouraged but not required)
• If this change requires a documentation update - notify the documentation team
• If this change has particular deployment requirements - notify the DevOps team
• Ensure that all UI additions follow WCAG AA requirements

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 27.75%. Comparing base (7bb8cae) to head (e4a41ea).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8816      +/-   ##
==========================================
- Coverage   27.76%   27.75%   -0.01%     
==========================================
  Files        2419     2419              
  Lines       70042    70024      -18     
  Branches    13046    13042       -4     
==========================================
- Hits        19444    19435       -9     
+ Misses      49085    49077       -8     
+ Partials     1513     1512       -1     

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[github-actions]

Checkmarx One – Scan Summary & Details – bd93d523-7448-4fbf-8f55-4813353b4505

No New Or Fixed Issues Found

[jlf0dev]

👏

[vincentsalucci]

Reviewed AC owned file 👍