Link grace note ties when cloning measures and staves

[miiizen]

Resolves: #20596

The issue was present whether the grace notes were visible or invisible, and also affected linked staves in the same score.

This PR also links stems and flags between score & parts. Previously, when making a note invisible the notehead, stem and flag would become invisible in the score but in the part only the notehead would be invisible.

Spotted the ultra-weird vtests

[mike-spa]

This PR also links stems and flags between score & parts. Previously, when making a note invisible the notehead, stem and flag would become invisible in the score but in the part only the notehead would be invisible.

Still haven't looked at the code, but I'm slightly hesitant about this (linking stems and flags). First things that came to my mind being:

• If beamed, the beam slant may slightly differ from score to part (because the angle also depends on horizontal spacing) and therefore also the resulting stem length will differ. Is that going to be a problem? What if I want to manually adjust a beam in the part but not in the score, is having linked stems going to be an issue?
• Can the chord (this I honestly don't know) be set to a different beaming type in the part than in the score? (and as a result, say, have the flag in the part but be beamed in the score?)

In general, the fact the stems and flags are mostly generated at layout time (and the fact that layout is independent between parts and score) makes me instinctively prefer to not have them linked.

[miiizen]

@mike-spa yeah, I don't love it. I decided to try it so this would use our property management and undo system, although having thought about those reasons, I think controlling these via the chord would be more sensible. This does mean that if you want an invisible stem or flag you'll have to do it manually in both score and part, but that's a limitation we have now (also the stemless setting is there).
I'll go through the linked chords in undoChangeNoteVisibility and use undoChangeProperty to change the visibility of their stems and flags.