Apply visibility to #getSuspendedPackageLauncherExtras

Callers shouldn't be able to get the launcher extras if the target
package isn't visible to them.

Bug: 202298672
Test: atest AppEnumerationTests
Test: atest SuspendPackagesTest
Test: manually using the PoC in the buganizer to ensure the symptom
      no longer exists.

Change-Id: Iad37765710b0b13f9c338bbacdd68be5d2574d22