Show restart transformation button after successful inline assist (#20439)

When using inline assist, after successfully generating a transformation
it's not possible to generate a new transformation. Currently, you have
to modify the prompt (i.e. add a `<SPACE>` and hit `<ENTER>`) to
regenerate.

So, I changed the restart button to be visible after a successful
transformation. And in that case I map it to a different keyboard
shortcut because `menu::Confirm` is mapped to accept the current
suggestion.

Now, I can invoke a series of transforms back to back until I get what I
want!

It might also be desired to keep the accept button visible after
modifying the prompt (before submitting it). In that case we'll need to
remap accept to an alternate key (perhaps the same alt-shift-enter I am
using for restart. That wouldn't be too insane to remember. But maybe
someone has a better idea.

I don't care what the shortcut is, I just want the ability to regenerate
without adding/deleting spaces.

## Before

**Two choices** after a suggestions is presented. Also, a great example
of why I would want to regenerate the suggestion, it left some tokens
`<rewrite_this>`!

![CleanShot 2024-12-13 at 00 34
09](https://github.com/user-attachments/assets/3c1786ca-8ec5-48e2-b3dd-64de36e61f6a)

## After

**Three choices** after a suggestion is presented, the circular icon is
for regenerate, just like you see if you modify the prompt text.
![CleanShot 2024-12-13 at 00 37
58](https://github.com/user-attachments/assets/ceda300f-0851-48bf-ad3a-be44308c734e)


## Release Notes:

- Added Restart Button to Inline Assistant When Prompt Is Unchanged

---------

Co-authored-by: Danilo Leal <daniloleal09@gmail.com>

crates/menu/src/menu.rs

@@ -19,5 +19,6 @@ actions!(
         SelectNext,
         SelectFirst,
         SelectLast,
+        Restart
     ]
 );