selftests/filesystems: add mntns cleanup test

Verify that destroying a mount namespace keeps its mounts connected.

Signed-off-by: Noah Orlando <Noah.Orlando@deshaw.com>
Link: https://patch.msgid.li

selftests/filesystems: add mntns cleanup test

Verify that destroying a mount namespace keeps its mounts connected.

Signed-off-by: Noah Orlando <Noah.Orlando@deshaw.com>
Link: https://patch.msgid.link/20260706182559.2496448-4-Noah.Orlando@deshaw.com
Signed-off-by: Christian Brauner (Amutable) <brauner@kernel.org>

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