roll back the change of building UI during bit new (#4782)

it slows down `bit new` dramatically

scopes/generator/generator/workspace-generator.ts

@@ -63,7 +63,7 @@ export class WorkspaceGenerator {
         copyPeerToRuntimeOnComponents: false,
         updateExisting: false,
       });
-      await this.buildUI();
+      // await this.buildUI(); // disabled for now. it takes too long
     } catch (err) {
       await fs.remove(this.workspacePath);
       throw err;