[pm] skip sending PACKAGE_CHANGED broadcast if package has been deleted

ag/15926042 introduced a regression when the broadcast could still be
sent if the package has been deleted. It's unlikely that this caused
b/231318806 (where the broadcast has already been sent out before the
package was deleted), but this still needs to be fixed.

+ Also remove an unnessary handler.post() because it is already inside
  the post.

BUG: 233612768
Test: presubmit
Change-Id: I25d906575a61d051df87a8985a5bb754642cc92b

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

@@ -3951,6 +3951,11 @@ public class PackageManagerService implements PackageSender, TestUtilityService
 
     void sendPackageChangedBroadcast(@NonNull Computer snapshot, String packageName,
             boolean dontKillApp, ArrayList<String> componentNames, int packageUid, String reason) {
+        PackageStateInternal setting = snapshot.getPackageStateInternal(packageName,
+                Process.SYSTEM_UID);
+        if (setting == null) {
+            return;
+        }
         final int userId = UserHandle.getUserId(packageUid);
         final boolean isInstantApp =
                 snapshot.isInstantAppInternal(packageName, userId, Process.SYSTEM_UID);

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

@@ -680,9 +680,9 @@ public final class SuspendPackageHelper {
                 } else {
                     intentExtras = null;
                 }
-                handler.post(() -> mBroadcastHelper.doSendBroadcast(action, null, intentExtras,
+                mBroadcastHelper.doSendBroadcast(action, null, intentExtras,
                         Intent.FLAG_RECEIVER_INCLUDE_BACKGROUND, packageName, null,
-                        targetUserIds, false, null, null));
+                        targetUserIds, false, null, null);
             }
         });
     }