coredump: prepare to simplify exit paths

The exit path is currently entangled with core pipe limit accounting
which is really unpleasant. Use a local variable in struct core_name
that remembers whether the count was incremented and if so to clean
decrement in once the coredump is done. Assert that this only happens
for pipes.

Link: https://lore.kernel.org/20250612-work-coredump-massage-v1-11-315c0c34ba94@kernel.org
Signed-off-by: Christian Brauner <brauner@kernel.org>

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