Follow up to https://github.com/zed-industries/zed/pull/40570.

This PR removes the UI treatment where we collapse a terminal command
into a disclosure component if it spans more than three lines. I
initially thought having this fancy treatment in the UI would make it
sleeker but it actually feels like a counter-productive move to
arbitrarily hide command lines; they're arguably always important to see
in full, even when they're super long. I'm happy to get some feedback
here, but I think for now, I'd feel better if users could see them all
without having to manually expand/collapse them.

Release Notes:

- N/A