Extract `_lora_call` into a shared free function in `lora.py` (#20306) #8389

Job	Run time
test-qnn / test-backend-linux (qnn, operators) / linux-job	15m 21s
test-qnn / test-backend-linux (qnn, models) / linux-job	28m 4s
test-qnn / test-backend-macos	0s
test-qnn / package-golden-artifacts	2m 25s
	45m 50s

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