Nonstandard dual-barcode lengths break pheniqs

[adamcantor22]

Describe the bug
Pheniqs configuration is currently hardcoded to only support forward and reverse barcodes of 8bp each. This is by far the most common situation, but I ran into a situation in which the forward barcodes were 12bp (I believe this used to be more common). This caused pheniqs to break, and I had to go in manually and fix it.

To Reproduce
Demultiplex a run using pheniqs with either barcode length not being 8bp

Solution
Configure pheniqs to automatically take whatever length of barcodes is present in the metadata for each run. This will not affect the error case of two barcodes in the same run/direction being different lengths, that will still error on upload.