Merge "Add ACTION_VPN_MANAGER_EVENT in ConstantsShim" into tm-dev am: 54cf86f04d am: 2d4312e9aa

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/modules/NetworkStack/+/18116239

Change-Id: I3f9ca28901014fb5686ef97766fb93aba071d65d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>