Fix text wrapping in commit message editors (#31030)

Don't hard wrap interactively; instead, soft wrap in `Bounded` mode
(editor width or 72 chars, whichever is smaller), and then hard wrap
before sending the commit message to git.

This also makes the soft wrap mode and width for commit messages
configurable in language settings.

Previously we didn't support soft wrap modes other than `EditorWidth` in
auto-height editors; I tried to add support for this by analogy with
code that was already there, and it seems to work pretty well.

Closes #27508

Release Notes:

- Fixed confusing wrapping behavior in commit message editors.

crates/language/src/language.rs

@@ -666,7 +666,7 @@ pub struct CodeLabel {
     pub filter_range: Range<usize>,
 }
 
-#[derive(Clone, Deserialize, JsonSchema)]
+#[derive(Clone, Debug, Deserialize, JsonSchema)]
 pub struct LanguageConfig {
     /// Human-readable name of the language.
     pub name: LanguageName,
@@ -777,7 +777,7 @@ pub struct LanguageMatcher {
 }
 
 /// The configuration for JSX tag auto-closing.
-#[derive(Clone, Deserialize, JsonSchema)]
+#[derive(Clone, Debug, Deserialize, JsonSchema)]
 pub struct JsxTagAutoCloseConfig {
     /// The name of the node for a opening tag
     pub open_tag_node_name: String,
@@ -810,7 +810,7 @@ pub struct JsxTagAutoCloseConfig {
 }
 
 /// The configuration for documentation block for this language.
-#[derive(Clone, Deserialize, JsonSchema)]
+#[derive(Clone, Debug, Deserialize, JsonSchema)]
 pub struct DocumentationConfig {
     /// A start tag of documentation block.
     pub start: Arc<str>,