Add a new permission to install testOnly apps

Added a new permission INSTALL_TEST_ONLY_PACKAGE
and granted it to shell, this will allow installing
testOnly apps from a testAPI.

Test: N/A
Bug: 183716601
Change-Id: I047a4013fb3462db3487eab2d1635ea75ae29264
diff --git a/packages/Shell/AndroidManifest.xml b/packages/Shell/AndroidManifest.xml
index b5af9ad..76ebdfe 100644
--- a/packages/Shell/AndroidManifest.xml
+++ b/packages/Shell/AndroidManifest.xml
@@ -163,6 +163,7 @@
     <uses-permission android:name="android.permission.SET_ORIENTATION" />
     <uses-permission android:name="android.permission.INSTALL_PACKAGES" />
     <uses-permission android:name="com.android.permission.USE_INSTALLER_V2" />
+    <uses-permission android:name="android.permission.INSTALL_TEST_ONLY_PACKAGE" />
     <uses-permission android:name="com.android.permission.USE_SYSTEM_DATA_LOADERS" />
     <uses-permission android:name="android.permission.MOVE_PACKAGE" />
     <uses-permission android:name="android.permission.KEEP_UNINSTALLED_PACKAGES" />