Don't append version/command to VCF header

[MattWellie]

Purpose

• the header lines for these multi-sample VCFs (00s of samples) are Massive, because by default BCFtools adds the full command used to generate the output as a line in the header

Proposed Changes

• use the --no-version flag which disables this behaviour

Checklist

• Related GitHub Issue created
• Tests covering new change
• Linting checks pass