[msbuild] Fix several issues in the MyWatchApp2 test project. (#7804)

* [msbuild] Fix the MyWatchApp2 test project to include resources already present.

Fixes several warnings:

> MyWatchApp2/obj/iPhoneSimulator/Debug/actool/cloned-assets/Resources/Images.xcassets : actool warning : The file "Icon-27.5x27.5@2x.png" for the image set "AppIcons" does not exist. [MyWatchApp2/MyWatchApp2.csproj]
> MyWatchApp2/obj/iPhoneSimulator/Debug/actool/cloned-assets/Resources/Images.xcassets : actool warning : The file "Icon-86x86@2x.png" for the image set "AppIcons" does not exist. [MyWatchApp2/MyWatchApp2.csproj]
> MyWatchApp2/obj/iPhoneSimulator/Debug/actool/cloned-assets/Resources/Images.xcassets : actool warning : The file "Icon-40x40@2x.png" for the image set "AppIcons" does not exist. [MyWatchApp2/MyWatchApp2.csproj]
> MyWatchApp2/obj/iPhoneSimulator/Debug/actool/cloned-assets/Resources/Images.xcassets : actool warning : The file "Icon-44x44@2x.png" for the image set "AppIcons" does not exist. [MyWatchApp2/MyWatchApp2.csproj]
> MyWatchApp2/obj/iPhoneSimulator/Debug/actool/cloned-assets/Resources/Images.xcassets : actool warning : The file "Icon-24x24@2x.png" for the image set "AppIcons" does not exist. [MyWatchApp2/MyWatchApp2.csproj]
> MyWatchApp2/obj/iPhoneSimulator/Debug/actool/cloned-assets/Resources/Images.xcassets : actool warning : The file "Icon-98x98@2x.png" for the image set "AppIcons" does not exist. [MyWatchApp2/MyWatchApp2.csproj]
> MyWatchApp2/obj/iPhoneSimulator/Debug/actool/cloned-assets/Resources/Images.xcassets : actool warning : The file "Icon-29x29@2x.png" for the image set "AppIcons" does not exist. [MyWatchApp2/MyWatchApp2.csproj]
> MyWatchApp2/obj/iPhoneSimulator/Debug/actool/cloned-assets/Resources/Images.xcassets : actool warning : The file "Icon-29x29@3x.png" for the image set "AppIcons" does not exist. [MyWatchApp2/MyWatchApp2.csproj]

* [msbuild] Add a 1024x1024 icon to the MyWatchApp2 test project.

Fixes this warning:

> MyWatchApp2/obj/iPhoneSimulator/Debug/actool/cloned-assets/Resources/Images.xcassets : actool warning : A 1024x1024 app store icon is required for watchOS apps [MyWatchApp2/MyWatchApp2.csproj]

* [msbuild] Remove the longLook icon entry for MyWatchApp2.

It doesn't seem to be a valid entry, there's no such entry when creating a
watchOS app in Xcode. Additionally it fixes this warning:

> MyWatchApp2/obj/iPhoneSimulator/Debug/actool/cloned-assets/Resources/Images.xcassets : actool warning : The app icon set "AppIcons" has an unassigned child. [MyWatchApp2/MyWatchApp2.csproj]

msbuild/tests/MyWatchApp2/MyWatchApp2.csproj

@@ -72,6 +72,14 @@
   </ItemGroup>
   <ItemGroup>
     <ImageAsset Include="Resources\Images.xcassets\AppIcons.appiconset\Contents.json" />
+    <ImageAsset Include="Resources\Images.xcassets\AppIcons.appiconset\Icon-24x24@2x.png" />
+    <ImageAsset Include="Resources\Images.xcassets\AppIcons.appiconset\Icon-27.5x27.5@2x.png" />
+    <ImageAsset Include="Resources\Images.xcassets\AppIcons.appiconset\Icon-29x29@2x.png" />
+    <ImageAsset Include="Resources\Images.xcassets\AppIcons.appiconset\Icon-29x29@3x.png" />
+    <ImageAsset Include="Resources\Images.xcassets\AppIcons.appiconset\Icon-40x40@2x.png" />
+    <ImageAsset Include="Resources\Images.xcassets\AppIcons.appiconset\Icon-86x86@2x.png" />
+    <ImageAsset Include="Resources\Images.xcassets\AppIcons.appiconset\Icon-98x98@2x.png" />
+    <ImageAsset Include="Resources\Images.xcassets\AppIcons.appiconset\Icon1024x1024.png" />
   </ItemGroup>
   <ItemGroup>
     <None Include="Info.plist" />

msbuild/tests/MyWatchApp2/Resources/Images.xcassets/AppIcons.appiconset/Contents.json

@@ -95,6 +95,12 @@
       "size" : "76x76",
       "scale" : "2x"
     },
+    {
+      "filename": "Icon1024x1024.png",
+      "size": "1024x1024",
+      "scale": "1x",
+      "idiom": "watch-marketing"
+    },
     {
       "size" : "24x24",
       "idiom" : "watch",
@@ -133,14 +139,6 @@
       "role" : "appLauncher",
       "subtype" : "38mm"
     },
-    {
-      "size" : "44x44",
-      "idiom" : "watch",
-      "scale" : "2x",
-      "filename" : "Icon-44x44@2x.png",
-      "role" : "longLook",
-      "subtype" : "42mm"
-    },
     {
       "size" : "86x86",
       "idiom" : "watch",