editor: Do not offset text in single line editors by default (#30599)

Follow-up to #30138

In the linked PR, I enabled the content offset for all editors by
default. However, this introduced a small regression: There are some
editors where we do not want the text to be offset, most notably the
rename and the filename editor.

This PR adds a method to disable the content offset for specific
editors. I specifically decided on an opt-out approach, since I think
that having the small offset for most editors is actually a benefit
instead of a disadvantage. However, open to change that or to disable
the offset for all editors but full mode editors by default if that
should be preferred.

| `main` | This PR |
| --- | --- |
|
![main](https://github.com/user-attachments/assets/a7e9249e-ac5c-422f-9f30-021ebf21850b)
|
![pr](https://github.com/user-attachments/assets/c5eef4e6-fad8-46ab-9f2d-d0ebdca01e2c)
|


Release Notes:

- N/A

crates/collab_ui/src/chat_panel/message_editor.rs

@@ -107,6 +107,7 @@ impl MessageEditor {
         let this = cx.entity().downgrade();
         editor.update(cx, |editor, cx| {
             editor.set_soft_wrap_mode(SoftWrap::EditorWidth, cx);
+            editor.set_offset_content(false, cx);
             editor.set_use_autoclose(false);
             editor.set_show_gutter(false, cx);
             editor.set_show_wrap_guides(false, cx);