Show more extensions (#8234)

This is a bandaid fix for:
https://github.com/zed-industries/zed/issues/8228.

Release Notes:

- N/A

crates/collab/src/api/extensions.rs

@@ -56,7 +56,7 @@ async fn get_extensions(
     Extension(app): Extension<Arc<AppState>>,
     Query(params): Query<GetExtensionsParams>,
 ) -> Result<Json<GetExtensionsResponse>> {
-    let extensions = app.db.get_extensions(params.filter.as_deref(), 30).await?;
+    let extensions = app.db.get_extensions(params.filter.as_deref(), 500).await?;
     Ok(Json(GetExtensionsResponse { data: extensions }))
 }