Extract `_lora_call` into a shared free function in `lora.py` (#20306) #1302

Job	Run time
test-webgpu / test-backend-linux (webgpu, models) / linux-job	30m 10s
test-webgpu / test-backend-linux (webgpu, operators) / linux-job	51m 27s
test-webgpu / test-backend-macos	0s
test-webgpu / package-golden-artifacts	1m 33s
	1h 23m 10s

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