Remove monkey.gltf #30464

Job	Run time
build (windows-latest)	7m 1s
build (ubuntu-latest)	3m 25s
check-doc	7m 50s
ci	2m 36s
build (macos-latest)	4m 31s
miri	11m 31s
run-examples-on-windows-dx12	19m 24s
check-bevy-internal-imports	4s
check-missing-examples-in-docs	54s
check-missing-features-in-docs	58s
markdownlint	1m 39s
check-compiles	3m 19s
build-wasm	43s
msrv	1m 3s
	1h 4m 58s

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