As such there is no hard and fast rule. It depends on what needs to be done. There is no point in fixing the plumbing then trying to plaster neatly up to the pipes. Conversely, it does not make sense to plaster then chop holes in the wall to bury pipes!
Generally as a rule of thumb, remove kitchen, do electrics, plaster then plumb.
Think the job through. Maybe you need to split the plumbing into first, second then a third fitting.
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