Closes #24820

This PR fixes the bug specified in issue
https://github.com/zed-industries/zed/issues/24820, now the matching
function checks if the cursor is above a comment or a directive before
defaulting to a bracket range as neovim does.

It also fixes fixes the `line_end` calculations so that when `%` is
pressed inside a bracket range


https://github.com/user-attachments/assets/f59daa6f-9769-45e8-bb8c-2d533470b59d

Release Notes:

- `fn matching()` checks for `preprocessor directives` or `comments`
before defaulting to any bracket range.
- In `fn matching()`line_end calculations avoid expanding a blank
current line into start..EOF.