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Metal backend: free only the destroyed delegate's memory #30096

Job	Run time
test-xnnpack / Resolve CI docker image / resolve	9s
test-xnnpack / test-backend-macos	0s
test-xnnpack / test-backend-linux (xnnpack, models) / linux-job	4m 20s
test-xnnpack / test-backend-linux (xnnpack, operators) / linux-job	4m 20s
test-xnnpack / package-golden-artifacts	0s
	8m 49s