Add ancestry for AnVIL data

[lynnpais]

Is your feature request related to a problem? Please describe.
Extend the ancestry pipeline to the AnVIL data. Once completed, add feature info on Github to inform users.

Describe the solution you'd like
Needs further review.

[lynnpais]

Consider showing this information more broadly in the Variant Lookup. Review seqr terms.

[lynnpais]

To the Imputed Population field, add hover over with info about the method - https://gnomad.broadinstitute.org/news/2023-11-genetic-ancestry/#genetic-ancestry-inference-in-gnomad