Apple

Fix pthreadpool subset corruption + executor deadlock; de-nest ExecuT… #22334

Job	Run time
set-version	8s
build-benchmark-app / macos-job	35m 2s
build-demo-ios / macos-job	18m 16s
build-frameworks-ios / macos-job	37m 28s
upload-demo-ios	45s
test-demo-ios / mobile-job (ios)	15m 29s
upload-frameworks-ios	1m 10s
	1h 48m 18s

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