vim: Allow count and repeat for "r" and "shift-r" action (#13287)

Fixing the "r" action just involved adapting `normal_replace` to replace
multiple characters.

Fixing the "shift-r" command was less straightforward. The bindings for
`vim::BeforeNormal` in replace mode were being overwritten and several
other steps required for action repetition were not performed. Finally,
the cursor adjustment after re-entering normal mode was duplicated
(`vim::BeforeNormal` was now triggered correctly) so I removed the
special case for replace mode.

Release Notes:

- Fixed vim "r" action to accept a count argument
- Fixed vim "shift-r" action to accept a count argument and allow
repetition

---------

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

crates/vim/src/normal/repeat.rs

@@ -31,6 +31,8 @@ fn repeatable_insert(action: &ReplayableAction) -> Option<Box<dyn Action>> {
                 || super::InsertLineBelow.partial_eq(&**action)
             {
                 Some(super::InsertLineBelow.boxed_clone())
+            } else if crate::replace::ToggleReplace.partial_eq(&**action) {
+                Some(crate::replace::ToggleReplace.boxed_clone())
             } else {
                 None
             }