Add project deletion GL hook processing for private projects

Deletions for private projects, while triggered by another project, should be tracked to show usage and currently active stats for private projects. As we are already planning on supporting project creation webhook events and storing information about them, adding additional information should be as easy as adding another possible route for events in the created service. The service should accept the event, retrieve the project to fetch the last active date, and update already existing columns in the table. If a row cannot be found, then the entry should be created from what information we can get from the event.