Setting to show/hide terminal title (#8559)

This PR adds settings for hiding title (breadcrumbs) from the terminal
toolbar. If the title is hidden, the toolbar disappears completely.

Example:

```json
"terminal": {
  "toolbar": {
    "title": true,
  }
}
```

[The PR that added the "toolbar"
setting](https://github.com/zed-industries/zed/pull/7338) didn't affect
toolbars of the terminals that are placed in the editor pane. This PR
fixes that.


Release Notes:

- Added support for configuring the terminal toolbar ([8125](https://github.com/zed-industries/zed/issues/8125))

crates/terminal/src/terminal_settings.rs

@@ -18,6 +18,11 @@ pub enum TerminalDockPosition {
     Right,
 }
 
+#[derive(Copy, Clone, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq)]
+pub struct Toolbar {
+    pub title: bool,
+}
+
 #[derive(Deserialize)]
 pub struct TerminalSettings {
     pub shell: Shell,
@@ -36,6 +41,7 @@ pub struct TerminalSettings {
     pub default_height: Pixels,
     pub detect_venv: VenvSettings,
     pub max_scroll_history_lines: Option<usize>,
+    pub toolbar: Toolbar,
 }
 
 #[derive(Clone, Debug, Default, Serialize, Deserialize, JsonSchema)]
@@ -155,6 +161,8 @@ pub struct TerminalSettingsContent {
     ///
     /// Default: 10_000
     pub max_scroll_history_lines: Option<usize>,
+    /// Toolbar related settings
+    pub toolbar: Option<ToolbarContent>,
 }
 
 impl settings::Settings for TerminalSettings {
@@ -274,3 +282,12 @@ pub enum WorkingDirectory {
     /// this platform's home directory  (if it can be found).
     Always { directory: String },
 }
+
+// Toolbar related settings
+#[derive(Clone, Debug, Default, Serialize, Deserialize, JsonSchema, PartialEq, Eq)]
+pub struct ToolbarContent {
+    /// Whether to display the terminal title in its toolbar.
+    ///
+    /// Default: true
+    pub title: Option<bool>,
+}