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[deposit] Disregard allele depth for multiallelic sites with same ALT (multiple deletions)

Svein Tore Koksrud Seljebotn requested to merge 1196-ad-not-working-with-decomposed-variants into dev

For multiallelic sites with different deletions, the allele depth comes out wrong if the ALT is the same. This is because of decomposition and normalization of the vcf.

Example:

5	13886244	.	CAA		C	481.7	PASS	.	GT:AD:DP:GQ:PL	./1:3,10:21:99:519,126,131
5	13886244	.	CAAA	C	481.7	PASS	.	GT:AD:DP:GQ:PL	1/.:3,8:21:99:519,111,246

Solution (for now): Disregard allele depth for these sites.

TODO: Fix this in the production database.

Closes LA-1196

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