Add Wasm and MonoAOTLLVM to DotNetSdkVersionValidator

[LoopedBard3]

Add Wasm and MonoAOTLLVM plain moniker support to DotNetSdkVersionValidator. I used the same check mentioned in the issue for determining the sdkversion, with an additional substring to remove the 'net' portion of the MsBuildMoniker (eg. net9.0).
Tested locally for MonoAOTLLVM successfully.

Fix: #2540

[timcassell]

I think we should use the version of the runtime rather than the MsBuildMoniker. CoreRuntime.TryGetVersion That way we can be sure we're not getting something like net8.0-windows or netcoreapp3.1 and we can make sure it's using a supported version (3.1 should be bumped up to 5.0/6.0). Now that I mention it, the config parser doesn't enforce the minimum version there either, so it would probably just explode if the host version is too old (do we care, though?).

[LoopedBard3]

Updated and tested locally for MonoAOTLLVM successfully.