Update to 300.1.0

[imalcolm1]

Description

Update projects to version 300.1.0 of the ArcGIS .NET SDK, and update Maui to .NET 10. The many deprecation warnings in the Maui project will be addressed separately.

Type of change

• Other enhancement

Platforms tested on

• WPF
• WinUI
• MAUI WinUI -- broken because of a packaging bug with the 300.1.0 toolkit daily
• MAUI Android
• MAUI iOS
• MAUI MacCatalyst

Checklist

• Self-review of changes
• All changes work as expected on all affected platforms
• There are no warnings related to changes
• Code is commented and follows .NET conventions and standards
• Codemaid and XAML styler extensions have been run on every changed file
• No unrelated changes have been made to any other code or project files
• Screenshots are correct size and display in description tab (800 x 600 on Windows, MAUI mobile platforms use the MAUI Windows screenshot)

[praveenaak]

LGTM