Move MergePolicyForLevel from MergingRun to IncomingRun #504
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As part of the changes to the scheduled merges prototype to introduce table unions, this refactoring was done. This is because the merging run gets reused in tree merges, where the merging policy makes no sense. So we move it up one level into something that's specific to the levels (the incomming run).
So this is the corresponding refactoring as in the prototype, and is preparation for introducing table unions.