Add integration tests for admin-only access to POST /api/country endpoints

[Copilot]

This PR adds comprehensive integration tests to ensure only admin users can access the POST country endpoints, preventing accidental removal of this security restriction in future changes.

Changes Made

New Test Suite

• Added tests/integration/tests/country/country-admin-access.test.ts with 6 test cases covering:
  • ✅ Admin users can access POST /api/country (expects 201)
  • ✅ Admin users can access POST /api/country/notification-info (expects 201)
  • ✅ Non-admin users are denied access to both endpoints (expects 403)
  • ✅ Unauthenticated users are denied access to both endpoints (expects 401)

Helper Functions

• Added getNonAdminToken() function in utility.helper.ts to create and authenticate non-admin users for testing
• Properly handles user creation with fallback for existing users

Test Integration

• Integrated new test suite into the main test runner (all.test.ts)
• Follows existing test patterns and coding standards

Validation

The tests verify the admin-only restrictions implemented via:

@ApiBearerAuth()
@UseGuards(RolesGuard)
@Roles(UserRole.Admin)
@Post()

This ensures that the security controls in the country controller cannot be accidentally removed during refactoring or feature development.

Fixes #2342.

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