Only run ConnectivityDiagnosticsManagerTest as AppModeFull. am: 7c9d2128de am: 286a433d78

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

Change-Id: I578364e32d76e94546e317b8e3518574f1bcb6d6
tree: f3f3e82a7c6fbd6260b4c519cecdd0594f2042b2
  1. tests/