Merge pull request #20330 from kishen-v/cherrypick-TestWatchRestore

Prevent flakes with TestWatchRestore

Author: serathius

server/storage/mvcc/watchable_store_test.go

@@ -676,7 +676,7 @@ func readEventsForSecond(t *testing.T, ws <-chan WatchResponse) []mvccpb.Event {
 			events = append(events, resp.Events...)
 		case <-deadline:
 			return events
-		case <-time.After(watchResyncPeriod):
+		case <-time.After(watchResyncPeriod * 3 / 2):
 			return events
 		}
 	}