Design module | Delete Design Feature

## Delete Architect's Design

### User Story
- As an architect, I want to be able to delete one of my designs from the collection. This way, I can easily manage and remove designs that are no longer needed.

### Task: Implement Design Deletion for Architects
- [x] Develop the Data Access Object (DAO) Layer for deleting designs.
- [x] Implement the Service Layer to handle the design deletion process for architects.
- [x] Create JUnit Test Cases to ensure the correctness of the design deletion functionality.
- [x] Verify that all test cases are passing successfully.
- [x] Enhance code clarity by adding clear and concise comments to explain intricate logic.

### DAO:
- [ ] deleteDesign

### Service:
- [ ] deleteDesign

### Test:
- [ ] testListDesignSuccess
- [ ] testListDesignFailure

### Estimation
- [ ] 1 hrs

## Flow
``` mermaid
graph TD
A[[Start]] -->|Architect Initiates Design Deletion| B([Fetch Design to Delete])
B -->|Design Found| C([Confirm Deletion])
C -->|Confirmed| E([Delete Design])
E --> F[[End]]
C -->|Cancelled| G([Cancel Deletion])
G --> H[[End]]
B -->|No Design Found| D{{Design Not Found}}
D --> H
```