Add float scalar input support (#18751) #2533

Job	Run time
test-xnnpack / test-backend-linux (xnnpack, models) / linux-job	4m 14s
test-xnnpack / test-backend-linux (xnnpack, operators) / linux-job	4m 15s
test-xnnpack / test-backend-macos	-6s
test-xnnpack / package-golden-artifacts	1s
	8m 24s

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