WS-1975 VLASS imaging flagtemplate in WS workflows

This allows the flagtemplate to be transferred into the vlass_quicklook, vlass_seci, and vlass_coarse workflows.

The flagtemplate file is named ${sdm}.flagtemplate.txt where the SDM ID is prepended to the filename in the VLASS manager before WS is called. After looking at the nraorsync code, I don't think it allows for wildcards in filenames (it basically does things like os.file.exists on the exact passed file name). I'm attempting to pass the SDM ID from the manager to construct the filename in the workflow templates.