Relax some find_neighbors() assertions that can be overzealous for 1D Elems #3853
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I don't think it will be easy to make #3851 work correctly in the short term, so this PR takes a different approach which is basically to just allow incomplete/incorrect neighbor information on meshes with multiple 1D Elems meeting in a single Node. To be clear, we were already doing this so the PR doesn't make it any worse, but we did have some overzealous asserts in
find_neighbors()which are currently being tripped when refining such meshes.