Refactor dynamic initializers to use service provider

[maliming]

Resolve #24570

[Copilot]

Pull request overview

This pull request refactors three dynamic initializers (SettingDynamicInitializer, PermissionDynamicInitializer, and FeatureDynamicInitializer) to use a service locator pattern instead of constructor injection. The changes simplify the constructors by injecting only IServiceProvider, and then resolving dependencies on-demand when they are needed.

• Simplified constructors to accept only IServiceProvider instead of multiple dependencies
• Changed from field-based dependency injection to on-demand service resolution using GetRequiredService/GetService
• Removed unused JetBrains.Annotations import and [CanBeNull] attributes
• Improved code formatting with multi-line parameter lists

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
SettingDynamicInitializer.cs	Refactored to use service locator pattern, resolving IOptions, IHostApplicationLifetime, ICancellationTokenProvider, IStaticSettingSaver, and IDynamicSettingDefinitionStore on-demand
PermissionDynamicInitializer.cs	Refactored to use service locator pattern, resolving IOptions, IHostApplicationLifetime, ICancellationTokenProvider, IStaticPermissionSaver, and IDynamicPermissionDefinitionStore on-demand
FeatureDynamicInitializer.cs	Refactored to use service locator pattern, resolving IOptions, IHostApplicationLifetime, ICancellationTokenProvider, IStaticFeatureSaver, and IDynamicFeatureDefinitionStore on-demand

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