They avoid it partially by simply moving their fingers better. Taking them off the strings instead of dragging them.
But a lot of it is just really good equipment. Someone usually operates specialized equipment to manage volume and pitch, and often they also filter out those little imperfections. It sounds complicated, but they just increase the threshold a sound needs to meet before making it to the speakers. Soft sounds like the squeaking of strings or a draft hitting the mic get filtered out.
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