[BUG] Email notification is not received if multiple recipients are added in the to list

[snehachoppavarapu]

Describe the bug
In the user_config.se_notifications_email_to_other_mail_id: 'sampath.yalamanchili2@nike.com, snehalatha.choppavarapu2@nike.com', i am providing multiple recipients but only the first recipient is receiving the email. If i change as list getting error
SparkExpectationsEmailException: error occurred while sending email notification from spark expectations project {"['sampath.yalamanchili2@nike.com', 'snehalatha.choppavarapu2@nike.com']": (553, b"5.1.3 <['sampath.yalamanchili2@nike.com', 'snehalatha.choppavarapu2@nike.com']>... Invalid route address")}
File /local_disk0/.ephemeral_nfs/cluster_libraries/python/lib/python3.11/site-packages/spark_expectations/notifications/plugins/email.py:53, in SparkExpectationsEmailPluginImpl.send_notification(self, _context, _config_args)
52 text = msg.as_string()
---> 53 server.sendmail(_context.get_mail_from, _context.get_to_mail, text)
54 server.quit()

To Reproduce
Steps to reproduce the behavior:

1. Go to se_user_conf provide user_config.se_notifications_email_to_other_mail_id: 'sampath.yalamanchili2@nike.com, snehalatha.choppavarapu2@nike.com' and run any dataquality rule.
2. Click on '....'
3. Scroll down to '....'
4. See error
   SparkExpectationsEmailException: error occurred while sending email notification from spark expectations project {"['sampath.yalamanchili2@nike.com', 'snehalatha.choppavarapu2@nike.com']": (553, b"5.1.3 <['sampath.yalamanchili2@nike.com', 'snehalatha.choppavarapu2@nike.com']>... Invalid route address")}
   File /local_disk0/.ephemeral_nfs/cluster_libraries/python/lib/python3.11/site-packages/spark_expectations/notifications/plugins/email.py:53, in SparkExpectationsEmailPluginImpl.send_notification(self, _context, _config_args)
   52 text = msg.as_string()
   ---> 53 server.sendmail(_context.get_mail_from, _context.get_to_mail, text)
   54 server.quit()

Expected behavior
Multiple recipients should receive email

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