BIT-2304: Fix pin unlock for new TDE accounts

[matt-livefront]

🎟️ Tracking

BIT-2304

📔 Objective

This fixes an issue where pin unlock fails for new TDE accounts. The user's encrypted private key needs to be persisted after the account is created to enable pin unlock to work.

📸 Screenshots

Before	After
Simulator.Screen.Recording.-.iPhone.15.Pro.-.2024-04-30.at.11.51.19.mp4	Simulator.Screen.Recording.-.iPhone.15.Pro.-.2024-04-30.at.11.49.38.mp4

⏰ 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]

	1 Warning
⚠️	Ignoring duplicate libraries: '-lbitwarden_uniffi'

Bitwarden code coverage

Total coverage: 86.46%

File	Coverage
BitwardenShared/Core/Auth/Repositories/AuthRepository.swift	97.12%

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Checkmarx One – Scan Summary & Details – ddae6d68-2827-4615-a3e8-8816f990b5c0

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