[release/8.0.2xx] [tests] fix InvalidTargetPlatformVersion for net8.0

[jonathanpeppers]

When 60dbcc9 was backported to .NET 8, the accompanying unit test was accidentally targeting .NET 9.

[jonathanpeppers]

I don't see Rolf's changes from dotnet/sdk@25b360d in this file:

/mnt/vss/_work/1/s/bin/Release/dotnet/sdk/8.0.204/Sdks/Microsoft.NET.Sdk/targets/Microsoft.NET.TargetFrameworkInference.targets

This causes the InvalidTargetPlatformVersion("android32") test to fail.

So, let me see if this starts working from a newer .NET SDK.

[jonathanpeppers]

Ok, I don't see that change in .NET 8 at all:

• https://github.com/dotnet/sdk/blob/release/8.0.4xx/src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.TargetFrameworkInference.targets

So, I guess we just remove part of this test.

[jonathanpeppers]

There are some random/flaky failures for ApplicationRunsWithDebuggerAndBreaks, but I'm going to merge so this gets us close to green.