fix: set fixed overflow widgets on monaco editor

[rdubrock]

This fixes the autosuggest window wandering away from the cursor for the check editor. The actual fix is adding fixedOverflowWidgets: false,, the rest is just reverting back the responsive layout.

I'm not sure why. It has something to do with how Monaco handles overflows, and how container is sizing things, but I'm unsure what's going on there

[ckbedwell]

LGTM 🚀

As discussed on a call just now, the one downside of this solution is the responsiveness of the script editor degrades slightly.

Just for future lookups of this PR, will leave a link to this issue for Monaco as it looks like they are related: microsoft/monaco-editor#2793

This comment on the issue makes a reference to somebody solved it by removing all properties that lead to a new stacking context.

MDN's definition of a stacking context includes scenarios where an element with a container-type value of size or inline-size which is what is going on here.