settings_ui: Add edit prediction settings (#41480)

Release Notes:

- N/A

---------

Co-authored-by: Ben Kunkle <Ben.kunkle@gmail.com>

crates/settings/src/settings_content/language.rs

@@ -151,7 +151,18 @@ pub struct CodestralSettingsContent {
 
 /// The mode in which edit predictions should be displayed.
 #[derive(
-    Copy, Clone, Debug, Default, Eq, PartialEq, Serialize, Deserialize, JsonSchema, MergeFrom,
+    Copy,
+    Clone,
+    Debug,
+    Default,
+    Eq,
+    PartialEq,
+    Serialize,
+    Deserialize,
+    JsonSchema,
+    MergeFrom,
+    strum::VariantArray,
+    strum::VariantNames,
 )]
 #[serde(rename_all = "snake_case")]
 pub enum EditPredictionsMode {