Fix device keys incorrectly being treated as strings

[Hinton]

Type of change

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

Objective

Device keys are generated from random u8 vectors. We incorrectly attempted to parse these as strings when decrypting them in the last trust device step.

Added a complete test which confirms the whole device approval process.

Before you submit

• Please add unit tests where it makes sense to do so

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (3064ac5) 51.65% compared to head (7217e70) 52.11%.

Files	Patch %	Lines
crates/bitwarden/src/auth/auth_request.rs	98.61%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #564      +/-   ##
==========================================
+ Coverage   51.65%   52.11%   +0.45%     
==========================================
  Files         163      163              
  Lines        8202     8267      +65     
==========================================
+ Hits         4237     4308      +71     
+ Misses       3965     3959       -6     

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[bitwarden-bot]

Checkmarx One – Scan Summary & Details – 9186ef63-676d-4302-8092-42405bf2cf7e

No New Or Fixed Issues Found