Fix tracing spans for system #34043

Job	Run time
build (windows-latest)	4m 42s
check-doc	5m 35s
ci	2m 19s
miri	7m 12s
run-examples-on-windows-dx12	12m 20s
build (ubuntu-latest)	2m 20s
build (macos-latest)	3m 7s
toml	8s
check-bevy-internal-imports	4s
check-missing-examples-in-docs	37s
check-missing-features-in-docs	32s
markdownlint	2m 44s
check-compiles	2m 48s
build-wasm	55s
msrv	1m 8s
	46m 31s

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