Specify Which Types of Warnings/Errors Generate 25Live Import Email Notifications

Currently, users can choose between receiving import email notifications for:
- sections with errors
- sections with errors and warnings
- all sections

This Feature Upvote is to allow users to specify which errors/warnings they would like an email for and (potentially) specify a different recipient for different types of errors/warning. For example, "Cannot assign location <location name> for any date" might be important for Academic Schedulers to pay close attention to; "Ignored unknown location name <location>" might be important for Functional Administrators to pay close attention to.