Improve default build times on arm64

[rolfbjarne]

The default build times for a Mac Catalyst app on arm64 is horrendous:

• dotnet new maccatalyst && dotnet build: 1 minute

Enabling the trimmer or the interpreter makes it much better:

• dotnet new maccatalyst && dotnet build /p:UseInterpreter: 17 seconds
• dotnet new maccatalyst && dotnet build /p:TrimMode=partial: 12 seconds
• dotnet new maccatalyst && dotnet build /p:TrimMode=full: 12 seconds
• dotnet new maccatalyst && dotnet build /p:TrimMode=partial /p:UseInterpreter=true: 12 seconds

So I suggest we enable the trimmer by default for Debug mode on Mac Catalyst (this would match how we handle iOS and tvOS in the simulator + we don't enable the interpreter on any other platform).

The same thing happens for the iOS and tvOS Simulators as well.