tasks: Reorganize task modal (#11752)

![image](https://github.com/zed-industries/zed/assets/24362066/bc7cc3d3-d9fc-4be6-b9b6-e3d8edf5b533)

Release Notes:
- Improved tasks modal by highlighting a distinction between a task
template and concrete task instance and surfacing available keybindings
more prominently. Task templates are now always available in the modal,
even if there's already a history entry with the same label.
- Changed default key binding for "picker::UseSelectedQuery" to `opt-e`.
95e0d5ed74Piotr Osiewicz committed on 5/14/2024, 9:22:09 AM· committed by GitHubparent0a096bf
10 files changedLine totals unavailable