fix: Update account data seeder to avoid invalid information (#7673)

- The message sender was incorrect. Incoming messages were created under the contact's name, and outgoing messages were created under the user's name instead of the reverse.
- The seed user's email address was incorrect in the message data.
- The Sendmail configuration overrode the Letter Opener config which made it difficult to test the email.
- This PR also fixes an ESLint lint issue on develop.

config/initializers/mailer.rb

@@ -27,12 +27,13 @@ Rails.application.configure do
 
   config.action_mailer.delivery_method = :smtp unless Rails.env.test?
   config.action_mailer.smtp_settings = smtp_settings
-  # You can use letter opener for your local development by setting the environment variable
-  config.action_mailer.delivery_method = :letter_opener if Rails.env.development? && ENV['LETTER_OPENER']
 
   # Use sendmail if using postfix for email
   config.action_mailer.delivery_method = :sendmail if ENV['SMTP_ADDRESS'].blank?
 
+  # You can use letter opener for your local development by setting the environment variable
+  config.action_mailer.delivery_method = :letter_opener if Rails.env.development? && ENV['LETTER_OPENER']
+
   #########################################
   # Configuration Related to Action MailBox
   #########################################