Merge branch 'ownership-checks-in-local-clones'

This topic addresses two CVEs: - CVE-2024-32020: Local clones may end up hardlinking files into the target repository's object database when source and target repository reside on the same disk. If the source repository is owned by a different user, then those hardlinked files may be rewritten at any point in time by the untrusted user. - CVE-2024-32021: When cloning a local source repository that contains symlinks via the filesystem, Git may create hardlinks to arbitrary user-readable files on the same filesystem as the target repository in the objects/ directory. Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>