assistant_context_editor: Remove suggest edits (#30286)

This PR removes the code for the "Suggest Edits" functionality from
Assistant1.

This feature was already disabled entirely with the launch of the Agent,
we're just cleaning up the unused code.

Release Notes:

- N/A

crates/assistant_settings/src/assistant_settings.rs

@@ -85,7 +85,6 @@ pub struct AssistantSettings {
     pub thread_summary_model: Option<LanguageModelSelection>,
     pub inline_alternatives: Vec<LanguageModelSelection>,
     pub using_outdated_settings_version: bool,
-    pub enable_experimental_live_diffs: bool,
     pub default_profile: AgentProfileId,
     pub profiles: IndexMap<AgentProfileId, AgentProfile>,
     pub always_allow_tool_actions: bool,
@@ -106,10 +105,6 @@ impl AssistantSettings {
             .and_then(|m| m.temperature)
     }
 
-    pub fn are_live_diffs_enabled(&self, _cx: &App) -> bool {
-        false
-    }
-
     pub fn set_inline_assistant_model(&mut self, provider: String, model: String) {
         self.inline_assistant_model = Some(LanguageModelSelection {
             provider: provider.into(),
@@ -257,7 +252,6 @@ impl AssistantSettingsContent {
                     commit_message_model: None,
                     thread_summary_model: None,
                     inline_alternatives: None,
-                    enable_experimental_live_diffs: None,
                     default_profile: None,
                     profiles: None,
                     always_allow_tool_actions: None,
@@ -288,7 +282,6 @@ impl AssistantSettingsContent {
                 commit_message_model: None,
                 thread_summary_model: None,
                 inline_alternatives: None,
-                enable_experimental_live_diffs: None,
                 default_profile: None,
                 profiles: None,
                 always_allow_tool_actions: None,
@@ -570,7 +563,6 @@ impl Default for VersionedAssistantSettingsContent {
             commit_message_model: None,
             thread_summary_model: None,
             inline_alternatives: None,
-            enable_experimental_live_diffs: None,
             default_profile: None,
             profiles: None,
             always_allow_tool_actions: None,
@@ -615,10 +607,6 @@ pub struct AssistantSettingsContentV2 {
     thread_summary_model: Option<LanguageModelSelection>,
     /// Additional models with which to generate alternatives when performing inline assists.
     inline_alternatives: Option<Vec<LanguageModelSelection>>,
-    /// Enable experimental live diffs in the assistant panel.
-    ///
-    /// Default: false
-    enable_experimental_live_diffs: Option<bool>,
     /// The default profile to use in the Agent.
     ///
     /// Default: write
@@ -845,10 +833,6 @@ impl Settings for AssistantSettings {
                 .thread_summary_model
                 .or(settings.thread_summary_model.take());
             merge(&mut settings.inline_alternatives, value.inline_alternatives);
-            merge(
-                &mut settings.enable_experimental_live_diffs,
-                value.enable_experimental_live_diffs,
-            );
             merge(
                 &mut settings.always_allow_tool_actions,
                 value.always_allow_tool_actions,
@@ -994,7 +978,6 @@ mod tests {
                                 dock: None,
                                 default_width: None,
                                 default_height: None,
-                                enable_experimental_live_diffs: None,
                                 default_profile: None,
                                 profiles: None,
                                 always_allow_tool_actions: None,