refactor: Adjust namespaces related to latest Uno packages

[agneszitte]

PR Type

What kind of change does this PR introduce?

• Refactoring (no functional changes, no api changes)

What is the new behavior?

Adjust namespaces related to latest Uno packages

PR Checklist

Please check if your PR fulfills the following requirements:

• Tested code with current supported SDKs
• Docs have been added/updated which fit documentation template. (for bug fixes / features)
• Unit Tests and/or UI Tests for the changes have been added (for bug fixes / features) (if applicable)
• Wasm UI Tests are not showing unexpected any differences. Validate PR Screenshots Compare Test Run results.
• Contains NO breaking changes
• Updated the Release Notes
• Associated with an issue (GitHub or internal)

[agneszitte]

PR Ready for review, BUT DO NOT MERGE. Tests are still in progress for some platforms

[Xiaoy312]

mostly just fix: src\Uno.Extensions.Templates\content\unoapp-extensions\MyExtensionsApp.Shared\Views\ProductsPage.xaml
nice to have: there are few more formatting issues i didnt want to mention anymore
if you are doing global changes, at least give some attention to the 1-2 lines before and after

[agneszitte]

mostly just fix: src\Uno.Extensions.Templates\content\unoapp-extensions\MyExtensionsApp.Shared\Views\ProductsPage.xaml nice to have: there are few more formatting issues i didnt want to mention anymore if you are doing global changes, at least give some attention to the 1-2 lines before and after

changes done, thank you!