Improve `bevy_input_focus` #53679

Job	Run time
build (windows-latest)	5m 13s
build (ubuntu-latest)	3m 25s
build (macos-latest)	2m 20s
check-bevy-internal-imports	8s
check-doc	10m 0s
check-missing-examples-in-docs	30s
ci	3m 31s
miri	11m 22s
run-examples-macos-metal	5m 44s
toml	2m 37s
typos	6s
check-missing-features-in-docs	33s
markdownlint	1m 12s
check-compiles-no-std	39s
check-compiles	4m 47s
msrv	1m 3s
build-wasm	49s
build-wasm-atomics	1m 30s
	55m 29s

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