Bug 1678155 - Restyle all heuristic result types when a one-off is selected/search mode is previewed. r=harry

We currently restyle URL heuristic results when a one-off is selected/search
mode is previewed, but afaict we should restyle all types. In the case of this
bug, the heuristic is a search result. I ended up rewriting most of
browser_oneOffs_heuristicRestyle.js to check various result types (URL, search,
and keyword) and both Alt-arrowing and non-Alt-arrowing down to the one-offs in
case that makes a difference.

This fixes part of bug 1678765, the part where we do the wrong thing when a
restyled keyword result is picked. It doesn't fix the visual part where the
action text is flush against the title text.

This also fixes a small error in `UrlbarView._on_SelectedOneOffButtonChanged`
where we were using `result.payload.title` when restyling heuristics, but
`result.title` is the correct property.

Depends on D97376

Differential Revision: https://phabricator.services.mozilla.com/D97843