simplify master+patch,remove ins when size != merge_size or has conflict slot (#20913)
* remove duplicate code and duplicate config of master+patch * drop all ins which has conflict slot or size < merge_size * user only need to set merge size,if ins num of same id is not equal to merge size, just drop these ins * user must make sure master data and patch data has no same slot whose feasigns are both non-zero, otherwise these ins will be dropped. (slot list should still be the same of both master and patch) * test=develop
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