Fixes an issue where a test project that contains native libraries will fool the AOT compiler task in thinking there are assemblies in different locations. This causes .aotdata files to not be bundled with the test app and ends up causing a runtime assertion.

…assemblies

`iOS` targets depend on these files being next to the original assemblies. But
that assumption breaks when `MonoAOTCompiler` copies the assemblies to `aot-in`
directory, and emits the `.aotdata` files there.

.. unmanaged assemblies.

1. Completely ignore unmanaged assemblies
2. Assemblies to be skipped for AOT, should still get copied to `aot-in`
dir. If this is not done, then blazor apps would break because they
skip` Microsoft.JSInterop.WebAssembly` but other assemblies depend on
it, thus causing `mono-aot-cross` to fail because it can't find the
JSInterop assembly.

…managed assemblies