New notifications

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Any background context you want to provide?

What's this PR do?

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Screenshots (if appropriate)

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Thanks for the fixes, it's working great! I have some other notes:

• Add notification messages for attaching a file; changing the priority; changing the due date; changing the title
• The message "A ticket has been assigned to you" should be changed out for the message "You've been assigned to ticket <id> by <name>"

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One more task: create a management command that when run, deletes read notifications that are over a day old, and any expired announcements. Management commands are run with ./manage.py name-of-file (for example, ./manage.py get_email --debug runs the code in management/commands/get_email.py). Here's some documentation: https://docs.djangoproject.com/en/5.0/howto/custom-management-commands/ You can use create_queue_permissions.py as a base, that file looks pretty straightforward.

This command won't need any options, and we have a system that can run commands every x minutes on our servers, so don't worry about when it should run. The command should use the current time (like now()) and Notifications.objects.filter(...).exists() to check if read notifs over a day old exist (and delete them if so); and check if any expired announcements exist, and delete them if so. I think that should finish up what needs to be done with notifications!