Mutate Observer #52021

Job	Run time
build (windows-latest)	3m 47s
build (ubuntu-latest)	3m 45s
toml	2m 2s
build (macos-latest)	3m 57s
check-bevy-internal-imports	4s
check-doc	10m 26s
check-missing-examples-in-docs	38s
ci	33s
miri	1m 5s
typos	6s
run-examples-macos-metal	5m 11s
check-compiles-no-std	0s
check-compiles	0s
check-missing-features-in-docs	0s
markdownlint	1m 4s
build-wasm	0s
build-wasm-atomics	0s
msrv	0s
	32m 38s

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