[bevy_ui/layout] Handle ui heirchy change edge cases #44243

Job	Run time
check-cfg	1m 47s
build (windows-latest)	6m 32s
check-bevy-internal-imports	7s
build (ubuntu-latest)	2m 44s
check-doc	8m 26s
build (macos-latest)	2m 13s
check-missing-examples-in-docs	32s
ci	3m 0s
miri	6m 9s
run-examples-macos-metal	4m 49s
toml	2m 1s
typos	7s
check-missing-features-in-docs	35s
markdownlint	1m 4s
check-compiles	5m 21s
msrv	1m 17s
build-wasm	1m 0s
build-wasm-atomics	1m 18s
	49m 2s

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