Add `--trim_polyG` to fastp

Add  --trim_poly_g flag to fastp process enforce poly-G trimming

See: https://github.com/BCCDC-PHL/basic-sequence-qc/issues/21 

We want to implement polyG trimming into TB-WGS operations. The taxon abundance pipeline is the first step of our workflow. Implementing here will incorporate the this into downstream processes efficiently