Module: `prep/metrics` miss one metric for `ga4gh_wgs_qc_metrics`

[lindaxiang]

Missing the following metric in https://github.com/icgc-argo-workflows/argo-modules/blob/main/modules/icgc-argo-workflows/prep/metrics/resources/usr/bin/dnaaln.py#L29

• cross_contamination_rate

Nice to have: sort the key:value in the report dict by alphabetic order.