Only run ConnectivityDiagnosticsManagerTest as AppModeFull. am: 7c9d2128de

Original change: https://googleplex-android-review.googlesource.com/c/platform/cts/+/11904000

Change-Id: Ia6830bfbb3c15fa04553433c8320eb0a79b3a299
tree: f3f3e82a7c6fbd6260b4c519cecdd0594f2042b2
  1. tests/