Build the absolute path an artifact with the given File-row fileId lives at:
<baseDir>/<fileId>.bin. Shared by the store (write) and the loader (read) so
they agree on the on-disk layout.
Parameters
baseDir: string
the resolved artifact base directory
fileId: string
the MJ: Files row id the artifact was stored under
Build the absolute path an artifact with the given File-row fileId lives at:
<baseDir>/<fileId>.bin. Shared by the store (write) and the loader (read) so they agree on the on-disk layout.