Use a consistent scale factor and resolution in stress tests #32039

Job	Run time
check-doc	11m 12s
check-bevy-internal-imports	7s
check-missing-examples-in-docs	33s
build (windows-latest)	7m 39s
build (ubuntu-latest)	3m 6s
ci	2m 48s
miri	5m 54s
run-examples-on-windows-dx12	11m 53s
build (macos-latest)	4m 6s
check-missing-features-in-docs	28s
markdownlint	1m 15s
check-compiles	4m 9s
build-wasm	49s
msrv	1m 2s
	55m 1s

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