Add CI test for CoreML LoRA multimethod export #1389

Job	Run time
test-vulkan / test-backend-linux (vulkan, models) / linux-job	21m 4s
test-vulkan / test-backend-linux (vulkan, operators) / linux-job	21m 31s
test-vulkan / test-backend-macos	0s
test-vulkan / package-golden-artifacts	3m 30s
	46m 5s

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