`SendKeystroke` seems to work for all ctrl keybinds. Prefer it over
`SendText` for readability.

showkey reports the same key sequences if I apply these keybinds to my
user keymap.

Before you mark this PR as ready for review, make sure that you have:
- [ ] Added a solid test coverage and/or screenshots from doing manual
testing
- [ ] Done a self-review taking into account security and performance
aspects
- [ ] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)

Release Notes:

- N/A

Co-authored-by: Jakub Konka <kubkon@jakubkonka.com>