BIT-2316: Fix vault timeout never lock migration

[matt-livefront]

🎟️ Tracking

BIT-2316

📔 Objective

A few fixes to ensure the never lock vault timeout migrates:

• Updates the keychain access group used to match the Xamarin/Maui app.
• Migrates data stored in keychain items from kSecAttrGeneric to kSecValueData, which puts the Xamarin/Maui data in the spot we're expecting it.
• Xamarin/Maui doesn't store a value in UserDefaults if never lock is selected - so if the vault timeout in UserDefaults is nil we check if there's a never lock key for the user, otherwise we default their timeout to 15 minutes.

⏰ 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]

	2 Warnings
⚠️	Ignoring duplicate libraries: '-lbitwarden_uniffi'
⚠️	BitwardenShared/Core/Platform/Extensions/Bundle+Extensions.swift has less than 80% code coverage

Bitwarden code coverage

Total coverage: 86.43%

File	Coverage
BitwardenShared/Core/Auth/Services/KeychainRepository.swift	90.34%
BitwardenShared/Core/Platform/Extensions/Bundle+Extensions.swift	69.57%
BitwardenShared/Core/Platform/Services/MigrationService.swift	98.15%
BitwardenShared/Core/Platform/Services/ServiceContainer.swift	96.30%
BitwardenShared/Core/Platform/Services/StateService.swift	97.36%

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[bitwarden-bot]

Checkmarx One – Scan Summary & Details – cf88d4ae-81a2-464b-bc50-60fac356fe9e

No New Or Fixed Issues Found

[jubie-livefront]

This is looking good to me!