Refactor ReactFlightClientConfigBundlerESM.js

[Pterjudin]

This PR refactors several functions in the client reference module to improve readability, maintainability, and error handling. Key changes include:

Improved Readability:

• Used destructuring for metadata and other complex structures to make the code more intuitive.
• Reformatted long lines for better clarity and readability.

Enhanced Error Handling:

• Added a fallback error in requireModule to handle cases where a module is not preloaded.
• Ensured consistent and meaningful error messages across the file.

Consistency:

• Used const for immutability where applicable.
• Ensured consistent use of destructuring and variable naming for clarity.