Don't deliver any new events once exiting. #6

Job	Run time
build (windows-latest)	5m 18s
build (ubuntu-latest)	2m 54s
build (macos-latest)	2m 43s
check-bevy-internal-imports	5s
check-cfg	1m 46s
check-doc	8m 18s
check-missing-examples-in-docs	28s
ci	3m 2s
miri	7m 54s
run-examples-macos-metal	5m 8s
toml	1m 59s
typos	5s
check-missing-features-in-docs	29s
markdownlint	1m 10s
check-compiles	5m 14s
msrv	1m 6s
build-wasm-atomics	1m 25s
build-wasm	1m 7s
	50m 11s

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