ls: we should always look for context (aka selinux)

[sylvestre]

Should fix tests/ls/selinux.sh

[github-actions]

GNU testsuite comparison:

GNU test failed: tests/ls/acl. tests/ls/acl is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/ls/follow-slink. tests/ls/follow-slink is passing on 'main'. Maybe you have to rebase?
GNU test failed: tests/ls/stat-failed. tests/ls/stat-failed is passing on 'main'. Maybe you have to rebase?
Skip an intermittent issue tests/misc/stdbuf (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/timeout/timeout (passes in this run but fails in the 'main' branch)
Congrats! The gnu test tests/ls/selinux is no longer failing!

[sylvestre]

moved here:
#8281