Apple

Refresh backend README with current progress (#20356) #22348

Job	Run time
set-version	9s
build-benchmark-app / macos-job	33m 15s
build-demo-ios / macos-job	17m 0s
build-frameworks-ios / macos-job	32m 41s
upload-demo-ios	44s
test-demo-ios / mobile-job (ios)	16m 46s
upload-frameworks-ios	1m 2s
	1h 41m 37s

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