[DRAFT] Extend somatic support in GenotypeGVCFs to use DRAGEN SQ #9188
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DRAGEN 3.8 introduced "somatic quality" for mitochondrial variants: https://support-docs.illumina.com/SW/DRAGEN_v40/Content/SW/DRAGEN/MitochondrialCalling.htm (those are v4 docs, but same principles apply). GenotypeGVCFs supported Mutect2-style mitochondrial GVCFs, but expected GQs to determine variant quality. This PR extends the Mutect2 joint genotyping logic to handle variants with SQs, as output by DRAGEN >= 3.8
Fixes #7840