Missing net9.0 Templates in Test Environment

[v-wuzhai]

Describe the bug

The net9.0 templates are missing in our test environment. This is likely because the Visual Studio images used in the build machines do not have the net9.0 templates installed yet. As a result, the tests are not able to detect and use the net9.0 templates.

https://github.com/dotnet/sdk/blob/main/test/dotnet-new.Tests/Approvals/DotnetNewHelpTests.CanShowHelpForTemplate_MatchOnLanguage.verified.txt
https://github.com/dotnet/sdk/blob/main/test/dotnet-new.Tests/Approvals/DotnetNewHelpTests.CanShowHelpForTemplate_MatchOnNonChoiceParam.verified.txt
https://github.com/dotnet/sdk/blob/main/test/dotnet-new.Tests/Approvals/DotnetNewHelpTests.CanShowHelpForTemplate_classlib.verified.txt
https://github.com/dotnet/sdk/blob/main/test/dotnet-new.Tests/Approvals/DotnetNewHelpTests.CanShowHelpForTemplate_console.verified.txt
https://github.com/dotnet/sdk/blob/main/test/dotnet-new.Tests/Approvals/DotnetNewHelpTests.CannotShowHelpForTemplate_MatchOnChoiceWithoutValue.verified.txt
https://github.com/dotnet/sdk/blob/main/test/dotnet-new.Tests/Approvals/DotnetNewInstantiateTests.CannotInstantiateTemplate_OnMultipleParameterErrors.verified.txt
https://github.com/dotnet/sdk/blob/main/test/dotnet-new.Tests/Approvals/DotnetNewInstantiateTests.CannotInstantiateTemplate_WhenChoiceParameterValueIsInvalid.verified.txt
https://github.com/dotnet/sdk/blob/main/test/dotnet-new.Tests/Approvals/DotnetNewInstantiateTests.CannotInstantiateTemplate_WhenChoiceParameterValueIsNotComplete.verified.txt

Note

Once the net9.0 templates are available, we will need to update our test environment to ensure these templates are correctly detected and used.