CmdPal: Refactor TopLevelCommandManager to use IExtensionService implementations

[michaeljolley]

Summary

The TopLevelCommandManager handles alot. And by "alot" I mean too much. In preparation for future types of extensions, this PR attempts to pull out the methods for loading/managing extensions to individual IExtensionServices.

These ExtensionServices will be injected the TopLevelCommandManager via dependency injection. It will iterate through them asking them to load their extensions. During that process, they will surface ICommandProviders back to the TopLevelCommandManager for display in Command Palette.

Currently, there are two types of IExtensionServices: BuiltInExtensionService and WinRTExtensionService.

• The BuiltInExtensionService receives all ICommandProviders registered with DI.
• The WinRTExtensionService manages out-of-process WinRT AppExtension providers.

Additional Changes

• Circular DI dependency resolved: BuiltInsCommandProvider no longer depends on IRootPageService.
  Previously, it required the IRootPageService solely for the dock command to open Command Palette (using the RootPage as its command.) Now, it uses a new GoHomeDockCommand which returns CommandResult.GoHome() with the existing onBeforeShowConfirmation callback to show the palette at the dock button position.

[github-actions]

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❌ Errors and Warnings	Count
⚠️ binary-file	1
⚠️ duplicate-pattern	2
❌ forbidden-pattern	1
⚠️ large-file	1

See ❌ Event descriptions for more information.

These words are not needed and should be removed

nullability

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on the michaeljolley/refactor-tlcm-extension-services branch (ℹ️ how do I use this?):

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perl - 'https://github.com/microsoft/PowerToys/actions/runs/27454773407/attempts/1' &&
git commit -m 'Update check-spelling metadata'

OR

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Forbidden patterns 🙅 (1)

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These forbidden patterns matched content:

Should be a

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