EmrEtlRunner: move max attempts configuration to EMR cluster configuration

[BenFradet]

• https://github.com/snowplow/snowplow/blob/master/3-enrich/spark-enrich/src/main/scala/com.snowplowanalytics.snowplow.enrich.spark/EnrichJob.scala#L78
• https://github.com/snowplow/snowplow/blob/master/4-storage/rdb-shredder/src/main/scala/com.snowplowanalytics.snowplow.storage/spark/ShredJob.scala#L72

need to be removed in favor of:

https://github.com/snowplow/snowplow/blob/master/3-enrich/emr-etl-runner/lib/snowplow-emr-etl-runner/emr_job.rb#L32

as

{
  "Classification" => "yarn-site",
  "Properties" => {
    "yarn.resourcemanager.am.max-attempts" => "1"
  }
}

unless rslifka/elasticity#138 is merged, in this case just use the elasticity api.