Migration: excluded files need to be removed (#5485)

* WIP

* Implement Remove attribute

* Enable tests

* Fix test

* Try a shorter test name

* Try more shortened test names

* Shorten some more

* Merge issues

* Try shortinging names more

* Fix test errors related to test asset renaming

TestAssets/NonRestoredTestProjects/PJAppWithDeprecatedNamedResourceOption/project.json

@@ -1,20 +0,0 @@
-{
-  "version": "1.0.0-*",
-  "namedResource": [ "My.Alias", "Strings.resx" ],
-  "buildOptions": {
-    "debugType": "portable",
-    "emitEntryPoint": true
-  },
-  "dependencies": {},
-  "frameworks": {
-    "netcoreapp1.0": {
-      "dependencies": {
-        "Microsoft.NETCore.App": {
-          "type": "platform",
-          "version": "1.0.0"
-        }
-      },
-      "imports": "dnxcore50"
-    }
-  }
-}

TestAssets/NonRestoredTestProjects/PJDeprecatedNamedResource/Program.cs

@@ -1,4 +1,4 @@
-using System;
+using System;
 using System.Linq;
 using System.Reflection;
 

TestAssets/NonRestoredTestProjects/PJDeprecatedNamedResource/project.json

@@ -0,0 +1,20 @@
+{
+    "version": "1.0.0-*",
+    "namedResource": [ "My.Alias", "Strings.resx" ],
+    "buildOptions": {
+        "debugType": "portable",
+        "emitEntryPoint": true
+    },
+    "dependencies": {},
+    "frameworks": {
+        "netcoreapp1.0": {
+            "dependencies": {
+                "Microsoft.NETCore.App": {
+                    "type": "platform",
+                    "version": "1.0.0"
+                }
+            },
+            "imports": "dnxcore50"
+        }
+    }
+}