Let's say I have out, Cultron Cultist (Reaction: After this unit resolves a strike, move an enhancement from one unit to another eligible unit controlled by the same player.) and I activate to move a pilot from one fighter to another. Is that considered attaching it to the second fighter?

Yes, when an enhancement moves from one unit to another it is attached to the destination unit. Reasoning behind that: when an enhanced goes from not being attached to a unit to being attached to a unit, it must go through the process of being attached.

Yes, that means that you can use a Cularian Cultist to move Boba Fett around and get extra uses out of his capture ability.