Add per-layer MLP type support for executorch export (#18856) #2163

Job	Run time
test-coreml / test-backend-macos (coreml, operators) / macos-job	3m 55s
test-coreml / test-backend-macos (coreml, models) / macos-job	3m 55s
test-coreml / package-golden-artifacts	0s
test-coreml / test-backend-linux	-7s
	7m 43s

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