persistent-nodemap: also list related file as part of the store
This make sure they are will be selected during upgrade, and copy based clone.
Differential Revision: https://phab.mercurial-scm.org/D9749
#require black test-repo $ cd $RUNTESTDIR/.. $ black --config=black.toml --check --diff `hg files 'set:(**.py + grep("^#!.*python")) - mercurial/thirdparty/**'`