Fix #23457 : Chord symbol copying

Fix #23457

When multiple staff-collateral elements are selected, copied and pasted, they are pasted according to the note (chord) count of the original passage rather than according to the tick distances.

This makes sense for all the supported element kinds, except chord symbols.

Corrected to paste chord symbols according to source tick distances. If a chord symbol falls on a tick where there is no SegChordRest segment, such a segment is created.