[pm] forbid deletion of protected packages

BUG: 242996180
Test: adb shell pm uninstall --user 0 com.google.android.apps.work.oobconfig
Test: Verified with the command above. Before this CL, the package can
be deleted. After this CL, the deletion will fail.

Change-Id: Iba408e536b340ea5d66ab499442c0c4f828fa36f
(cherry picked from commit 15f85c7fa9)
Merged-In: Iba408e536b340ea5d66ab499442c0c4f828fa36f

services/core/java/com/android/server/pm/PackageManagerService.java

@@ -21354,6 +21354,20 @@ public class PackageManagerService extends IPackageManager.Stub
 
         final String packageName = versionedPackage.getPackageName();
         final long versionCode = versionedPackage.getLongVersionCode();
+
+        if (mProtectedPackages.isPackageStateProtected(userId, packageName)) {
+            mHandler.post(() -> {
+                try {
+                    Slog.w(TAG, "Attempted to delete protected package: " + packageName);
+                    observer.onPackageDeleted(packageName,
+                            PackageManager.DELETE_FAILED_INTERNAL_ERROR, null);
+                } catch (RemoteException re) {
+                }
+            });
+            return;
+        }
+
+
         final String internalPackageName;
 
         try {