refactor(Loading): update Loading component import paths

- Changed import paths for the Loading component from "@/app/loading" to "@/components/loading" across multiple files to maintain consistency and improve modularity.
- Removed the Loading component definition from loading.tsx, simplifying the file structure.

src/app/marketing/edit/[id]/page.tsx

@@ -1,5 +1,5 @@
 "use client";
-import Loading from "@/app/loading";
+import Loading from "@/components/loading";
 import { useGetCmsDetails, useUpdateCms } from "@/hooks/queries/useCmsQueries";
 import { BreadcrumbItem } from "@/types/shared";
 import { use } from "react";