selftests: add test for detached mount tree propagation

Test that detached mount trees receive propagation events.

Link: https://lore.kernel.org/r/20250225-work-mount-propagation-v1-2-e6e3724500eb@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Christian Brauner 2025-02-25 11:15:47 +01:00
commit 12e40cbb0e
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