alarm_test already runs in presubmit am: 670b0afded am: 3fa0f2b872 am: 97943f63ee am: 625237135f

Original change: https://android-review.googlesource.com/c/platform/external/grpc-grpc/+/1653127

Change-Id: I5ce7f73167bdf88b777b6dd3f7e1871cc88eeaf9