Use `embedded_asset` to load shaders #36914

Job	Run time
build (windows-latest)	5m 34s
check-bevy-internal-imports	4s
check-doc	6m 27s
build (ubuntu-latest)	2m 29s
build (macos-latest)	7m 17s
check-missing-examples-in-docs	29s
ci	2m 19s
miri	7m 41s
run-examples-on-windows-dx12	12m 2s
toml	9s
check-missing-features-in-docs	30s
markdownlint	1m 19s
check-compiles	3m 16s
msrv	1m 4s
build-wasm	56s
	51m 36s

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