feat(mail-test): implement email testing functionality
- Created MailTestController to handle email sending requests. - Added SendTestMailRequest for validating email input. - Developed MailTestService to manage email sending logic. - Introduced TestMail Mailable for formatting test emails. - Defined API route for sending test emails. - Created EmailIntegrationSeeder to seed email integration settings. - Updated DatabaseSeeder to include EmailIntegrationSeeder. - Added MailTestControllerTest to ensure email sending functionality works as expected.
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