vim: Refactor and fix multiline operations (#25055)

Changes:
- [x] Cursor at the start during yank operations on objects (`yip`,
`yab` etc).
- [x] Refactors this: Trim all leading and trailing whitespace from
inner multiline bracket selection.
  - This leaves a nicely indented line when doing `ci{` `vi{d` etc
  - [x] Checks for empty selection
  - [x] Removed moving cursor to the start in visual bracket operations

This cleans up the previous implementation by providing a simpler check
in `surrounding_markers`, instead of calling a new function in
`expand_object`. No functionality was changed there except for handling
the empty selection and removing some cursor adjustments that should not
have been there after further testing.

Release Notes:

- N/A

crates/vim/test_data/test_multiline_surrounding_character_objects.json

@@ -1,20 +0,0 @@
-{"Put":{"state":"func empty(a string) bool {\n     if a == \"\" {\n      return true\n   }\n   ˇreturn false\n}"}}
-{"Key":"v"}
-{"Key":"i"}
-{"Key":"{"}
-{"Get":{"state":"func empty(a string) bool {\n     «ˇif a == \"\" {\n      return true\n   }\n   return false»\n}","mode":"Visual"}}
-{"Put":{"state":"func empty(a string) bool {\n     if a == \"\" {\n         ˇreturn true\n     }\n     return false\n}"}}
-{"Key":"v"}
-{"Key":"i"}
-{"Key":"{"}
-{"Get":{"state":"func empty(a string) bool {\n     if a == \"\" {\n         «ˇreturn true»\n     }\n     return false\n}","mode":"Visual"}}
-{"Put":{"state":"func empty(a string) bool {\n     if a == \"\" ˇ{\n         return true\n     }\n     return false\n}"}}
-{"Key":"v"}
-{"Key":"i"}
-{"Key":"{"}
-{"Get":{"state":"func empty(a string) bool {\n     if a == \"\" {\n         «ˇreturn true»\n     }\n     return false\n}","mode":"Visual"}}
-{"Put":{"state":"func empty(a string) bool {\n     if a == \"\" {\n         return true\n     }\n     return false\nˇ}"}}
-{"Key":"v"}
-{"Key":"i"}
-{"Key":"{"}
-{"Get":{"state":"func empty(a string) bool {\n     «ˇif a == \"\" {\n         return true\n     }\n     return false»\n}","mode":"Visual"}}