gpui: Implement From<String> for ElementId (#44447)

Release Notes:

- N/A

## Before

```rs
div()
    .id(SharedString::from(format!("process-entry-{ix}-command")))
```

## After

```rs
div()
    .id(format!("process-entry-{ix}-command"))
```

crates/agent_ui/src/acp/thread_view.rs

@@ -3509,7 +3509,7 @@ impl AcpThreadView {
                                         (method.id.0.clone(), method.name.clone())
                                     };
 
-                                    Button::new(SharedString::from(method_id.clone()), name)
+                                    Button::new(method_id.clone(), name)
                                         .label_size(LabelSize::Small)
                                         .map(|this| {
                                             if ix == 0 {

crates/agent_ui/src/agent_configuration.rs

@@ -838,7 +838,7 @@ impl AgentConfiguration {
                             .min_w_0()
                             .child(
                                 h_flex()
-                                    .id(SharedString::from(format!("tooltip-{}", item_id)))
+                                    .id(format!("tooltip-{}", item_id))
                                     .h_full()
                                     .w_3()
                                     .mr_2()

crates/agent_ui/src/agent_configuration/configure_context_server_tools_modal.rs

@@ -87,7 +87,7 @@ impl ConfigureContextServerToolsModal {
                             v_flex()
                                 .child(
                                     h_flex()
-                                        .id(SharedString::from(format!("tool-header-{}", index)))
+                                        .id(format!("tool-header-{}", index))
                                         .py_1()
                                         .pl_1()
                                         .pr_2()

crates/agent_ui/src/agent_configuration/manage_profiles_modal.rs

@@ -422,7 +422,7 @@ impl ManageProfilesModal {
         let is_focused = profile.navigation.focus_handle.contains_focused(window, cx);
 
         div()
-            .id(SharedString::from(format!("profile-{}", profile.id)))
+            .id(format!("profile-{}", profile.id))
             .track_focus(&profile.navigation.focus_handle)
             .on_action({
                 let profile_id = profile.id.clone();
@@ -431,7 +431,7 @@ impl ManageProfilesModal {
                 })
             })
             .child(
-                ListItem::new(SharedString::from(format!("profile-{}", profile.id)))
+                ListItem::new(format!("profile-{}", profile.id))
                     .toggle_state(is_focused)
                     .inset(true)
                     .spacing(ListItemSpacing::Sparse)

crates/agent_ui/src/profile_selector.rs

@@ -542,7 +542,7 @@ impl PickerDelegate for ProfilePickerDelegate {
                 let is_active = active_id == candidate.id;
 
                 Some(
-                    ListItem::new(SharedString::from(candidate.id.0.clone()))
+                    ListItem::new(candidate.id.0.clone())
                         .inset(true)
                         .spacing(ListItemSpacing::Sparse)
                         .toggle_state(selected)