Migrate more b64

[Hinton]

🎟️ Tracking

📔 Objective

Wraps up the b64 migration.

⏰ Reminders before review

• Contributor guidelines followed
• All formatters and local linters executed and passed
• Written new unit and / or integration tests where applicable
• Protected functional changes with optionality (feature flags)
• Used internationalization (i18n) for all UI strings
• CI builds passed
• Communicated to DevOps any deployment requirements
• Updated any necessary documentation (Confluence, contributing docs) or informed the documentation
  team

🦮 Reviewer guidelines

• 👍 (:+1:) or similar for great changes
• 📝 (:memo:) or ℹ️ (:information_source:) for notes or general info
• ❓ (:question:) for questions
• 🤔 (:thinking:) or 💭 (:thought_balloon:) for more open inquiry that's not quite a confirmed
  issue and could potentially benefit from discussion
• 🎨 (:art:) for suggestions / improvements
• ❌ (:x:) or ⚠️ (:warning:) for more significant problems or concerns needing attention
• 🌱 (:seedling:) or ♻️ (:recycle:) for future improvements or indications of technical debt
• ⛏ (:pick:) for minor or nitpick changes

[github-actions]

Checkmarx One – Scan Summary & Details – f513d986-95f6-43ff-bf25-838824273d03

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

[codecov]

Codecov Report

❌ Patch coverage is 69.56522% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 76.88%. Comparing base (8a7175f) to head (9b6b400).
⚠️ Report is 16 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/bitwarden-fido/src/lib.rs	18.18%	9 Missing ⚠️
crates/bitwarden-fido/src/types.rs	0.00%	4 Missing ⚠️
crates/bitwarden-encoding/src/b64.rs	0.00%	3 Missing ⚠️
crates/bitwarden-encoding/src/b64url.rs	0.00%	3 Missing ⚠️
crates/bitwarden-core/src/key_management/crypto.rs	0.00%	1 Missing ⚠️
...crypto/src/safe/password_protected_key_envelope.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #411      +/-   ##
==========================================
+ Coverage   76.75%   76.88%   +0.13%     
==========================================
  Files         270      270              
  Lines       25664    25574      -90     
==========================================
- Hits        19698    19663      -35     
+ Misses       5966     5911      -55     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
4.7% Duplication on New Code

See analysis details on SonarQube Cloud

[mzieniukbw]

KM looks good

[gbubemismith]

Vault changes look good