[testing] Ignore sample tests for ga

[rmarinho]

Description of Change

Sample tests are failing because Community Toolkit doesn't support net10.0 GA

Related issue:
#32151

Users/builder/azdo/_work/_temp/test-dir/Buildmauinet100144212026/Buildmauinet100144212026.csproj : error NU1608: Warning As Error: Detected package version outside of dependency constraint: CommunityToolkit.Maui 11.1.1 requires Microsoft.Maui.Controls (>= 9.0.30 && < 10.0.0) but version Microsoft.Maui.Controls 10.0.0 was resolved.
/Users/builder/azdo/_work/_temp/test-dir/Buildmauinet100144212026/Buildmauinet100144212026.csproj : error NU1608: Warning As Error: Detected package version outside of dependency constraint: CommunityToolkit.Maui.Core 11.1.1 requires Microsoft.Maui.Core (>= 9.0.30 && < 10.0.0) but version Microsoft.Maui.Core 10.0.0 was resolved.
/Users/builder/azdo/_work/_temp/test-dir/Buildmauinet100144212026/Buildmauinet100144212026.csproj : error NU1107: Version conflict detected for Microsoft.Maui.Essentials. Install/reference Microsoft.Maui.Essentials 10.0.0 directly to project Buildmauinet100144212026 to resolve this issue. 
/Users/builder/azdo/_work/_temp/test-dir/Buildmauinet100144212026/Buildmauinet100144212026.csproj : error NU1107:  Buildmauinet100144212026 -> Microsoft.Maui.Controls 10.0.0 -> Microsoft.Maui.Controls.Core 10.0.0 -> Microsoft.Maui.Core 10.0.0 -> Microsoft.Maui.Essentials (>= 10.0.0) 
/Users/builder/azdo/_work/_temp/test-dir/Buildmauinet100144212026/Buildmauinet100144212026.csproj : error NU1107:  Buildmauinet100144212026 -> CommunityToolkit.Maui 11.1.1 -> CommunityToolkit.Maui.Core 11.1.1 -> Microsoft.Maui.Essentials (>= 9.0.30 && < 10.0.0).

[Copilot]

Pull Request Overview

This PR temporarily disables sample content template tests for .NET 10.0 GA due to a dependency conflict with CommunityToolkit.Maui, which currently only supports .NET MAUI 9.x and is incompatible with the 10.0.0 release.

Key Changes:

• Three test cases using --sample-content flag are commented out to prevent build failures
• Tests will be re-enabled once CommunityToolkit.Maui releases a version compatible with .NET 10.0

[rmarinho]

/backport to release/10.0.1xx

[github-actions]

Started backporting to release/10.0.1xx: https://github.com/dotnet/maui/actions/runs/18715968500