Describe the bug
The email footer text:
"This is an automated email notification, which is unable to receive replies. + ETC"
Is duplicated in multiple files in the code base. Let's do a refactor so it is in just one location, presumably the script that actually sends the email. We don't need to store this text in the database, it is not part of the actual email content.

git grep -i "this is an automated"
.setup/data/random/CourseEmailBody.txt:An Instructor/TA/Mentor has reopened your grade inquiry for gradeable, Grades Released Homework.\n\nta writes:\nThe answer is incorrect\n\n--\nNOTE: This is an automated email notification, which is unable to receive replies.\nPlease refer to the course syllabus for contact information for your teaching staff. Update your email notification settings for this course here: http://localhost:1511/courses/f21/sample/notifications/settings
.setup/data/random/CourseEmailBody.txt:\nSAMPLE\nhello?\n\n!\n\nAuthor: Quinn I. Click here for more info: http://localhost:1511/courses/f21/sample/forum/threads/10\n--\nNOTE: This is an automated email notification, which is unable to receive replies.\nPlease refer to the course syllabus for contact information for your teaching staff. Update your email notification settings for this course here: http://localhost:1511/courses/f21/sample/notifications/settings
sbin/send_notification.py: f"--\nNOTE: This is an automated "
site/app/models/Email.php: $body .= "\n\n--\nNOTE: This is an automated email notification, which is unable to receive replies.";
site/tests/app/models/EmailTester.php: private string $footer = "\n\n--\nNOTE: This is an automated email notification, which is unable to receive replies.\nPlease refer to the course syllabus for contact information for your teaching staff.\nUpdate your email notification settings for this course here: http://localhost/courses/f21/csci1100/notifications/settings";
site/tests/app/models/EmailTester.php: $expected_body = 'email body' . "\n\n--\nNOTE: This is an automated email notification, which is unable to receive replies.";