firewire: core: add KUnit tests for failure of tree building

Abdun Nihaal has reported a memory leak when tree building fails in the
middle of self ID sequence enumeration. This is caused by an invalid
self ID sequence and is not a common occurrence.

This commit is intended to assist in fixing the issue by adding KUnit
tests to show the cases in which the memory leak is triggered. The leak
occurs internally in the build_tree() function, therefore it cannot be
detected directly by the tests.

Link: https://lore.kernel.org/r/20260810064119.410324-4-o-takashi@sakamocchi.jp
Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>

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