Return detailed request validation error messages

[Aadesh-Baral]

Enhance the error messages returned during request validation. Provide specific information about the validation failure, such as missing or invalid parameters, so that frontend can show users where and what actually went wrong. This will also assist developers in troubleshooting and resolving issues.

Tasks:

• Create a decorator to validate request against provided dto class. Refactor request body validation using decorator #5920
• Apply the decorator on route functions to validate request. Apply decorator to validate request on route functions. #5947