Closes #52292

This PR preserves the scroll offset of the List used in Recent Projects
while deleting items. It does that by:
- Adding the `is_scrolled_to_end` method to the GPUI list, which helps
us determine where the new selection should be, since it depends on
whether items are taking the deleted slot from below or above.
- Adding `ScrollBehavior` to `update_matches`, which lets you preserve
the scroll offset even for `List` (not `UniformList`) after a reset.

Before:


https://github.com/user-attachments/assets/e3eb7092-59ec-4b54-b57a-503555addd27

After:


https://github.com/user-attachments/assets/6929f6a0-04d7-44f9-a9b2-f9e5c077b368

Release Notes:

- Fixed the recent projects list jumping to the top after deleting a
project, so you can now bulk-delete entries by repeatedly clicking the
delete icon or pressing the keybind.