WiX: Add _TestingInterop

This includes the library created in swiftlang/swift-testing#1369

Resolves rdar://163673609

Author: jerryjrchen

platforms/Windows/platforms/windows/windows.wxs

@@ -360,6 +360,9 @@
         <Component Directory="Testing_usr_bin64a" DiskId="2">
           <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\bin64a\_Testing_WinSDK.dll" />
         </Component>
+        <Component Directory="Testing_usr_bin64a" DiskId="2">
+          <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\bin64a\_TestingInterop.dll" />
+        </Component>
 
         <Component Directory="Testing_usr_lib_swift_windows_arm64" DiskId="2">
           <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\lib\swift\windows\aarch64\Testing.lib" />
@@ -370,6 +373,9 @@
         <Component Directory="Testing_usr_lib_swift_windows_arm64" DiskId="2">
           <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\lib\swift\windows\aarch64\_Testing_WinSDK.lib" />
         </Component>
+        <Component Directory="Testing_usr_lib_swift_windows_arm64" DiskId="2">
+          <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\lib\swift\windows\aarch64\_TestingInterop.lib" />
+        </Component>
 
         <Component Directory="Testing.swiftmodule" DiskId="2">
           <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\lib\swift\windows\Testing.swiftmodule\aarch64-unknown-windows-msvc.swiftdoc" />
@@ -404,6 +410,9 @@
         <Component Directory="Testing_usr_bin64" DiskId="3">
           <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\bin64\_Testing_WinSDK.dll" />
         </Component>
+        <Component Directory="Testing_usr_bin64" DiskId="3">
+          <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\bin64\_TestingInterop.dll" />
+        </Component>
 
         <Component Directory="Testing_usr_lib_swift_windows_x64" DiskId="3">
           <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\lib\swift\windows\x86_64\Testing.lib" />
@@ -414,6 +423,9 @@
         <Component Directory="Testing_usr_lib_swift_windows_x64" DiskId="3">
           <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\lib\swift\windows\x86_64\_Testing_WinSDK.lib" />
         </Component>
+        <Component Directory="Testing_usr_lib_swift_windows_x64" DiskId="3">
+          <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\lib\swift\windows\x86_64\_TestingInterop.lib" />
+        </Component>
 
         <Component Directory="Testing.swiftmodule" DiskId="3">
           <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\lib\swift\windows\Testing.swiftmodule\x86_64-unknown-windows-msvc.swiftdoc" />
@@ -448,6 +460,9 @@
         <Component Directory="Testing_usr_bin32" DiskId="4">
           <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\bin32\_Testing_WinSDK.dll" />
         </Component>
+        <Component Directory="Testing_usr_bin32" DiskId="4">
+          <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\bin32\_TestingInterop.dll" />
+        </Component>
 
         <Component Directory="Testing_usr_lib_swift_windows_x86" DiskId="4">
           <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\lib\swift\windows\i686\Testing.lib" />
@@ -458,6 +473,9 @@
         <Component Directory="Testing_usr_lib_swift_windows_x86" DiskId="4">
           <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\lib\swift\windows\i686\_Testing_WinSDK.lib" />
         </Component>
+        <Component Directory="Testing_usr_lib_swift_windows_x86" DiskId="4">
+          <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\lib\swift\windows\i686\_TestingInterop.lib" />
+        </Component>
 
         <Component Directory="Testing.swiftmodule" DiskId="4">
           <File Source="$(PlatformRoot)\Developer\Library\Testing-$(ProductVersion)\usr\lib\swift\windows\Testing.swiftmodule\i686-unknown-windows-msvc.swiftdoc" />