multiple match collections in montage qc

[djkapner]

EM_aligner_python has the capability to use matches from multiple collections, but, the montage QC here can only handle one:
https://github.com/AllenInstitute/render-modules/blob/a4ca1b66c88d43f15fd1be7b0142838a47d1ae3b/rendermodules/em_montage_qc/schemas.py#L17-L19

If multiple collections are used (for example, from the scope and the workflow), this should be updated to handle a list of collections.