External AF SVID INFO key is String type

[epiercehoffman]

Updates

Tweaks to AnnotateVcf workflow:

• SVID INFO key from AnnotateExternalAF should be a String type, not Float. This was causing issues with Hail
  • There are two ModifyVcf tasks, one in AnnotateExternalAF and one in AnnotateExternalAFPerContig. It appears that only the one in the per-contig WDL is used, but I updated both because they aren't identical so I was wary of deleting the other
• Output name of annotated VCF was {prefix}.annotated.vcf.vcf.gz; removed extra .vcf
• Spacing

Testing

• Validated all WDLs and JSONs with womtool
• Tested AnnotateVcf and verified that the output VCF name had one .vcf and the header reflected that the SVID INFO key is of type String

[mwalker174]

Thank you, looks fine to me!