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
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Co-authored-by: Giteabot <teabot@gitea.io>