PM-10947: Handle key connector unlock for existing user

[matt-livefront]

🎟️ Tracking

PM-10947

📔 Objective

This handles vault unlock for an existing user who uses key connector. If the identity token response has a key connector URL, we use the existence of that to fetch the user's key from key connector and unlock the vault.

📸 Screenshots

https://github.com/user-attachments/assets/79dd9061-c9b3-4e28-8aab-62476aebb901

⏰ 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[bot]]

Checkmarx One – Scan Summary & Details – 4e207949-c256-4ede-b5ae-2b16f615e384

No New Or Fixed Issues Found

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 88.57%. Comparing base (6cba789) to head (70fe2a6). Report is 5 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #842 +/- ## ========================================== + Coverage 88.51% 88.57% +0.05% ========================================== Files 606 607 +1 Lines 30262 30299 +37 ========================================== + Hits 26787 26836 +49 + Misses 3475 3463 -12 ```

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