[Tech Debt] Clean up fetch content with fallback

[AmeanAsad]

• fetchContentWithFallback as 3 different fetching blocks that can be combined into 1.
• We should create an async generator that yields the nodes. It would yield the CDN url then await the nodes list being loaded, then add the customer fallback origin in the end. That way we can combine the fetch blocks into 1 and iterate the nodes list without having to modify it mid loop.