Fix cmd+k in terminal and fix sporadic keybind misses (#7388)

This fixes `cmd+k` in the terminal taking 1s to have an effect. It is
now immediate.

It also fixes #7270 by ensuring that we don't set a bad state when
matching keybindings.

It matches keybindings per context and if it finds a match on a lower
context it doesn't keep pending keystrokes. If it finds two matches on
the same context level, requiring more keystrokes, then it waits.



Release Notes:

- Fixed `cmd-k` in terminal taking 1s to have an effect. Also fixed
sporadic non-matching of keybindings if there are overlapping
keybindings.
([#7270](https://github.com/zed-industries/zed/issues/7270)).

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Co-authored-by: Conrad <conrad@zed.dev>
Co-authored-by: Conrad Irwin <conrad.irwin@gmail.com>