https://github.com/pantsbuild/pants/pull/8905 may also be a mitigation for the running out of disk space issue (avoid copying files to a hermetic sandbox and instead using symlinks if they're materialized commonly enough)

nice! this is definitely still useful even after my change gets merged - reducing the size of the same file getting writen to disk a bunch of times doesn't mean we're not still writing the same file to disk a bunch of times