Self-Review Checklist:

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

Closes #52926
Follow-up to #48861
cc @SomeoneToIgnore

Release Notes:

- Edited buffers are no longer saved by default before running a task,
but you can still configure this using the "save" field in `tasks.json`.

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Co-authored-by: Kirill Bulatov <mail4score@gmail.com>