gpui: Don't export named Context from prelude (#21869)

This PR updates the `gpui::prelude` to not export the `Context` trait
named.

This prevents some naming clashes in downstream consumers.

Release Notes:

- N/A

crates/workspace/src/workspace.rs

@@ -92,11 +92,7 @@ use task::SpawnInTerminal;
 use theme::{ActiveTheme, SystemAppearance, ThemeSettings};
 pub use toolbar::{Toolbar, ToolbarItemEvent, ToolbarItemLocation, ToolbarItemView};
 pub use ui;
-use ui::{
-    div, h_flex, px, BorrowAppContext, Context as _, Div, FluentBuilder, InteractiveElement as _,
-    IntoElement, ParentElement as _, Pixels, SharedString, Styled as _, ViewContext,
-    VisualContext as _, WindowContext,
-};
+use ui::prelude::*;
 use util::{paths::SanitizedPath, ResultExt, TryFutureExt};
 use uuid::Uuid;
 pub use workspace_settings::{
@@ -597,7 +593,6 @@ impl AppState {
         use node_runtime::NodeRuntime;
         use session::Session;
         use settings::SettingsStore;
-        use ui::Context as _;
 
         if !cx.has_global::<SettingsStore>() {
             let settings_store = SettingsStore::test(cx);
@@ -7856,7 +7851,7 @@ mod tests {
     }
 
     mod register_project_item_tests {
-        use ui::Context as _;
+        use gpui::Context as _;
 
         use super::*;