Backport #34061 by eeyrjmr
The doctor storage check reconstructs the lfs oid by producing a string
where the path separator is stripped
ab/dc/efg -> abdcefg. Windows however uses a backslash and thus the
ReplaceAll call doesn't produce the correct oid resulting in all lfs
objects being classed as orphaned.
This PR allows this to be more OS agnostic.
Closes#34039
Co-authored-by: JonRB <4564448+eeyrjmr@users.noreply.github.com>
