Apple

rename top-level install_requirements.{py,sh,bat} to install_executorch #5764

Job	Run time
set-version	1s
build-benchmark-app / macos-job	54m 49s
build-demo-ios / macos-job	49m 47s
build-frameworks-ios / macos-job	1h 3m 2s
upload-demo-ios	39s
test-demo-ios / mobile-job (ios)	15m 45s
upload-frameworks-ios	45s
	3h 4m 48s

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