VSCode settings import refactor (#40513)

A small follow-up to the settings refactor of a few weeks ago to move
all the VSCode settings imports
to one place.

This should make it easier to spot missing imports, and easier to test
the importer.

Release Notes:

- N/A

crates/agent_settings/src/agent_settings.rs

@@ -10,7 +10,7 @@ use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 use settings::{
     DefaultAgentView, DockPosition, LanguageModelParameters, LanguageModelSelection,
-    NotifyWhenAgentWaiting, Settings, SettingsContent,
+    NotifyWhenAgentWaiting, Settings,
 };
 
 pub use crate::agent_profile::*;
@@ -185,14 +185,4 @@ impl Settings for AgentSettings {
             message_editor_min_lines: agent.message_editor_min_lines.unwrap(),
         }
     }
-
-    fn import_from_vscode(vscode: &settings::VsCodeSettings, current: &mut SettingsContent) {
-        if let Some(b) = vscode
-            .read_value("chat.agent.enabled")
-            .and_then(|b| b.as_bool())
-        {
-            current.agent.get_or_insert_default().enabled = Some(b);
-            current.agent.get_or_insert_default().button = Some(b);
-        }
-    }
 }