Remove Mono.WebAssembly.Interop (dotnet/extensions#2934)

* Remove Mono.WebAssembly.Interop


\n\nCommit migrated from dotnet/extensions@4ac4b19

Author: pranavkm

src/JSInterop/JSInterop.slnf

@@ -3,8 +3,7 @@
     "path": "..\\..\\Extensions.sln",
     "projects": [
       "src\\JSInterop\\Microsoft.JSInterop\\src\\Microsoft.JSInterop.csproj",
-      "src\\JSInterop\\Microsoft.JSInterop\\test\\Microsoft.JSInterop.Tests.csproj",
-      "src\\JSInterop\\Mono.WebAssembly.Interop\\src\\Mono.WebAssembly.Interop.csproj",
+      "src\\JSInterop\\Microsoft.JSInterop\\test\\Microsoft.JSInterop.Tests.csproj"
     ]
   }
 }