feat: allow login using either email or username

- Updated the signIn method to check if the identifier is an email or username.
- Modified the authentication process to handle both email and username.

src/main/java/leonardo/labutilities/qualitylabpro/services/email/EmailService.java

@@ -33,7 +33,7 @@ public class EmailService {
 	@Value("${spring.mail.username}")
 	String emailFrom;
 
-	@Value("${identifier.to.send.list}")
+	@Value("${email.to.send.list}")
 	String emailListString;