Self-Review Checklist:

- [x] I've reviewed my own diff for quality, security, and reliability
- [x] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
- [x] Performance impact has been considered and is acceptable

Closes #55576

This PR adds a new `editor: toggle breadcrumb` actions that toggles the
breadcrumbs for the active item without persisting on `settings.json`.
Similar to what `editor: toggle minimap` does.


https://github.com/user-attachments/assets/7179a0c8-6a5e-4716-86b8-abde8aa61f68

A simple test was added to check that using this action doesn't change
the settings, and that changing an unrelated setting keeps the toggled
action as the source of truth for the breadcrumb visibility.

Release Notes:

- Added `editor: toggle breadcrumb` action to toggle breadcrumb of
active item without persisting on `settings.json`