AS-260: Change max manifest testing to batch API calls

Retrospectively, this likely should have been in multiple PRs.
Yeah, I was struggling with how to phrase that. Would this work better:
param name: Name root - an underscore followed by a count incrementing from 0 to batch_size will be appended to the provided name root to create incrementing names for each policy in the batch (i.e. "name"+"_#")