Add employee tagging in job history

Problem: With everyone being remote now we've all gotten used to @ing someone when we need someone to follow up in slack, or gsheets, or salesforce. Ideally we can bring this functionality to the job history section for when I need someone to do something.

Solution: Provide this @ing functionality and have it flow either into an automated email that gets sent, or a notification, or a task in task management.

Impact: This allows the office to more easily communicate with one another when everyone may not be in the office.