Add fallback when EJ scheduling fails. am: 8d7e5fecbe am: 3fafd94b35

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/providers/CalendarProvider/+/23476484

Change-Id: I4edcb8743b54258160558d62b6e2ed96a78b31f3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>