Implemented a Global Exception Handler using @ControllerAdvice to manage common excep...

Implemented a Global Exception Handler using @ControllerAdvice to manage common exceptions across the application.

- Handles validation errors (MethodArgumentNotValidException) with detailed field error responses.
- Handles missing request parameters (MissingServletRequestParameterException) with clear error messages.
- Catches all other uncaught exceptions and returns a generic internal server error response.
- This improves error consistency, observability, and simplifies controller logic.

Issue-ID: CPS-2827
Change-Id: I702ca917d71af997a5743288732dbc1c91ee2798
Signed-off-by: sourabh_sourabh <sourabh.sourabh@est.tech>