Add EntityMut::get_mut_by_id_unchecked #51979

Job	Run time
ci	4m 2s
miri	11m 0s
build (windows-latest)	6m 16s
check-doc	10m 40s
check-bevy-internal-imports	4s
build (ubuntu-latest)	3m 33s
build (macos-latest)	3m 37s
check-missing-examples-in-docs	30s
run-examples-macos-metal	5m 39s
toml	2m 4s
typos	9s
check-missing-features-in-docs	29s
markdownlint	1m 13s
check-compiles-no-std	39s
check-compiles	5m 48s
build-wasm-atomics	1m 39s
msrv	1m 19s
build-wasm	1m 18s
	59m 59s

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