Set Windows Folder Picker Initial Path

[TheCodeTraveler]

Description of Change

This PR bumps the <PackageReference Include="Microsoft.WindowsAppSDK"/> to v2.0.0 enabling the use of Microsoft.Windows.Storage.Pickers.FolderPicker.SuggestedFolder

Linked Issues

Fixes the feature initially added in #3030 which was temporarily removed in #3076.

PR Checklist

• Has a linked Issue, and the Issue has been approved(bug) or Championed (feature/proposal)
• Has tests (if omitted, state reason in description)
• Has samples (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Changes adhere to coding standard
• Documentation created or updated: https://github.com/MicrosoftDocs/CommunityToolkit/pulls

Additional information

This PR will remain in Draft until Microsoft.WindowsAppSDK v2.0.0 is promoted to a stable release

[Copilot]

Pull request overview

This PR updates the Windows-specific folder picker implementation to support setting an initial folder by upgrading the Windows App SDK dependency and wiring the initial path into the picker configuration.

Changes:

• Bump Microsoft.WindowsAppSDK to 2.0.0 for the Windows target framework in CommunityToolkit.Maui.Core.
• Enable FolderPicker.SuggestedFolder on Windows by assigning the initialPath argument.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
src/CommunityToolkit.Maui.Core/Essentials/FolderPicker/FolderPickerImplementation.windows.cs	Uses the initialPath parameter to set the Windows folder picker’s suggested initial folder.
src/CommunityToolkit.Maui.Core/CommunityToolkit.Maui.Core.csproj	Updates the Windows App SDK package reference to enable the required picker API.