fix #23879: unlink chord symbols within score/part

Don't duplicate chord symbols between linked staves within a score/part.
Treat staff text similarly.
fix #23883: create segments for chord symbols

When adding a chord symbol to a staff in a score with a linked part,
create a new segment for the chord symbol in the linked part if
necessary.
add tests

add tests: add chord to score with linked staff, add chord to score with
linked part
also exclude figured bass, lyrics, dynamics
Merge pull request #590 from MarcSabatella/23879-unlink-chord-symbols

Correct behavior of chord symbols on linked staves/parts