selftests/namespaces: fourth active reference count tests

Test user namespace active ref tracking via credential lifecycle.

Link: https://patch.msgid.link/20251029-work-namespace-nstree-listns-v4-26-2e6f823ebdc0@kernel.org
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
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Christian Brauner 2025-10-29 13:20:39 +01:00
commit 28655ff253
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