Apple

Drop cache_loaded_ flag; gate init on metadata.empty() (#20245) #22263

Job	Run time
set-version	7s
build-demo-ios / macos-job	16m 22s
build-benchmark-app / macos-job	33m 29s
build-frameworks-ios / macos-job	32m 17s
upload-demo-ios	47s
test-demo-ios / mobile-job (ios)	13m 58s
upload-frameworks-ios	52s
	1h 37m 52s

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