Feature request: Support standard machine types on Google Backend for running workflows on modern GPUs

[javiergaitan]

Motivation

A significant limitation of using the Google Backend on Cromwell today is that only N* machine types can be used on GCP. In particular, N* machine types do not provide access to modern GPUs and users interested in running workflows on GPUs are limited to older NVIDIA T4 or V100 accelerators.

Proposal

Add support for standard machine types, which would allow running workflows on a much broader range of machine types on GCP, including those configured with modern GPUs (e.g.: NVIDIA A100, H100).

Related: #6558