Allow to hide more buttons with the settings (#30565)

* project search button in the status bar
```jsonc
"search": {
  "button": false
},
```

* project diagnostics button in the status bar
```jsonc
"diagnostics": {
  "button": false
}
```

* project name and host buttons in the title bar
```jsonc
"title_bar": {
    "show_project_items": false
}
```

* git branch button in the title bar
```jsonc
"title_bar": {
    "show_branch_name": false
}
```

Before:
<img width="1728" alt="before"
src="https://github.com/user-attachments/assets/4b13b431-3ac1-43b3-8ac7-469e5a9ccf7e"
/>

After:
<img width="1728" alt="after"
src="https://github.com/user-attachments/assets/baf2765a-e27b-47a3-8897-89152b7a7c95"
/>


Release Notes:

- Added more settings to hide buttons from Zed UI

crates/editor/src/editor_settings.rs

@@ -4,6 +4,7 @@ use project::project_settings::DiagnosticSeverity;
 use schemars::JsonSchema;
 use serde::{Deserialize, Serialize};
 use settings::{Settings, SettingsSources, VsCodeSettings};
+use util::serde::default_true;
 
 #[derive(Deserialize, Clone)]
 pub struct EditorSettings {
@@ -276,6 +277,9 @@ pub enum ScrollBeyondLastLine {
 /// Default options for buffer and project search items.
 #[derive(Copy, Clone, Default, Debug, Serialize, Deserialize, JsonSchema, PartialEq, Eq)]
 pub struct SearchSettings {
+    /// Whether to show the project search button in the status bar.
+    #[serde(default = "default_true")]
+    pub button: bool,
     #[serde(default)]
     pub whole_word: bool,
     #[serde(default)]