User module | Delete User Feature

## User Delete Process

### User Story
- As a user, I want the ability to deactivate my account in the application.
- Deactivating my account ensures that my personal information is no longer accessible or displayed.

### Task: Implement User Account Deactivation
- [ ] Develop the Data Access Object (DAO) Layer for user account deactivation.
- [ ] Implement the Service Layer to handle the user account deactivation process.
- [ ] Create JUnit Test Cases to validate the correctness of the account deactivation functionality.
- [ ] Ensure that all test cases pass successfully.
- [ ] Enhance code clarity by adding clear and concise comments to explain intricate logic.

### DAO:
- [ ] deleteUser()

### Service:
- [ ] deleteUser()

### Test:
- [ ] testDeleteUserSuccess()
- [ ] testDeleteUserUserNotFound()

### Estimation
- [ ] 1 hrs

### Flow
``` mermaid
graph TD
A[[Start]] --> B([User Initiates Account Delete])
B --> C([Check If User Exists and Active])
C --> |User Not Found or Inactive|H([Validation Exception])
C --> |Display Delete Confirmation| D([User Confirms Delete])
D --> |User Confirms| E[(Delete Account)]
E --> |Return true| F[User Deleted Successfully]
E --> |Fail| G[Failed to Delete User]
H --> G
F --> I[[End]]
G --> I
```