Fix #15726 (Marks & Jumps): Some elements are lost when changing time signature

[pacebes]

Resolves: #15726 (Jumps & Marks)

This PR keeps as much Marks and Jumps as possible when changing time signature

• I signed the CLA
• The title of the PR describes the problem it addresses
• Each commit's message describes its purpose and effects, and references the issue it resolves
• If changes are extensive, there is a sequence of easily reviewable commits
• The code in the PR follows the coding rules
• There are no unnecessary changes
• The code compiles and runs on my machine, preferably after each commit individually
• I created a unit test or vtest to verify the changes I made (if applicable)

[pacebes]

We could use the following MuseScore tests files to test this PR: Score_15726_JM_tests.zip

Every "row" within a Score is duplicated so you can easily check if the TimeSignature change works as it should

[Jojo-Schmitz]

Here I'd ask why FINE isn't in RIGHT_MARKERS. Not your fault or issue at hand here, but still...

[pacebes]

I made myself the same question, but I decided there should be a reason ...