gate depth reads on !WEBGL2 #31839

Job	Run time
build (windows-latest)	4m 20s
build (ubuntu-latest)	2m 46s
check-bevy-internal-imports	8s
build (macos-latest)	4m 34s
check-doc	7m 32s
ci	1m 36s
miri	10m 16s
check-missing-examples-in-docs	33s
run-examples-on-windows-dx12	11m 17s
check-missing-features-in-docs	56s
check-compiles	3m 57s
markdownlint	1m 26s
msrv	1m 8s
build-wasm	45s
	51m 14s

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