Make `pane::CloseAllItems` best effort (#45368)

Closes #ISSUE

Release Notes:

- Fixed an issue where the `pane: close all items` action would give up
if you hit "Cancel" on the prompt for what to do with a dirty buffer
e05dcecac4Ben Kunkle committed on 12/19/2025, 4:21:56 PM· committed by GitHubparent32600f2
2 files changedLine totals unavailable