Fix properties panel not updating when pasting

[juli27]

Resolves: #27846

The InspectorListModel listens for selection changes on NotationInteraction to update the displayed elements. NotationInteraction notifies selection listeners in apply() (indirectly via the undo stack). However, since apply() is called before the selection is updated in pasteSelection(), no selection update notification was sent.

• 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)

[juli27]

I changed it to the suggested solution and also took the liberty to cleanup selectAndStartEditIfNeeded() a bit.