Paste single onto range: paste element multiple times as appropriate

[cbjeukendrup]

When applying a palette element to a range selection, that element is potentially multiple times: articulations are applied to all notes in the selection, some text elements are applied to each selected staff, et cetera.

The same should happen when pasting a single element onto a range selection. The challenge here is to reuse the logic from NotationInteraction::applyPaletteElement without causing duplication and awkwardness.

Stems from #25854 (comment).