refactor: standardize delete endpoint response with ResponseEntity

[mridul-20]

Pull Request Template

Description

This PR refactors the delete endpoint in EmployeeController to return a ResponseEntity, ensuring consistency with other endpoints and improving response handling. The change standardizes the response format, making it clearer and more aligned with best practices.

Changes

• Updated deleteEmployee method to return ResponseEntity<Map<String, Boolean>> instead of just Map<String, Boolean>
• Added ResponseEntity.ok() wrapper to maintain consistency with other endpoints

Type of change

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[pratik-mahalle]

Hey @mridul-20, Thank you for raising the pr. Our team will review the changes soon