[TESTS] Ignore SnapshotMissingException in snapshotWithStuckNodeTest

The retry mechanism in the transport layer might cause the delete snapshot request to be executed twice if the cluster master is closed while the request is executed. First time delete snapshot request is getting successfully executed on the old master and then it is retried on the newly elected master. When the new master tries to delete the snapshot - the snapshot no longer exists (since it was successfully deleted by the old master) and SnapshotMissingException is returned.