Investigate using the new T4 Command-Line Tool for .NET

At some point in the future it might be worth looking at having the repo updated to use the [.NET 6 version](https://devblogs.microsoft.com/dotnet/t4-command-line-tool-for-dotnet/) of the tt generator for the generated code as it might resolve some friction users have had making changes to the code generators on non-Windows platforms outside of Visual Studio https://github.com/dotnet/aspnetcore/pull/49285#discussion_r1260840666.

_Originally posted by @martincostello in https://github.com/dotnet/aspnetcore/pull/49285#discussion_r1260867641_