[Refector] Upgrade to CommunityToolkit 8.0

[gaviny82]

Why do you need this feature?

The new WCT 8.0 has been released.

Suggest an implementation

Incompatible items:

• [x] AdaptiveGridView has been replaced by UniformGridLayout for ItemsRepeater.
• [x] StaggeredPanel API has been updated (used on NewsPage)
• [x] The notification helpers in the Toolkit have migrated to the Windows App SDK, see their documentation here to get started. (used in LaunchService.cs)
• [ ] MarkDownTextBlock is unavailable in the new WCT. A new version is under development in WCT Labs.
• [ ] ColorPicker is in PR for the new WCT.

Attachment

No response

[natsurainko]

Notification Helpers 将在 JumpListService 的重构中一起更新 MarkDownTextBlock、ColorPicker还在等待 WCT 的进一步更新