[bevy_ui/layout] Update tests to get GlobalTransform properly #39778

Job	Run time
build (windows-latest)	5m 37s
build (ubuntu-latest)	2m 41s
build (macos-latest)	30m 6s
check-bevy-internal-imports	4s
check-cfg	1m 16s
check-doc	7m 42s
check-missing-examples-in-docs	35s
ci	2m 30s
miri	6m 4s
run-examples-macos-metal	4m 55s
toml	2m 4s
typos	9s
check-missing-features-in-docs	31s
markdownlint	1m 17s
check-compiles	3m 28s
build-wasm	0s
build-wasm-atomics	0s
msrv	0s
	1h 8m 59s

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