Add a basic "X comments" below "X attendees" on event tiles using total_num_responses in threads.py

[jesseallhands]

Problem

The number of comments is not listed on event tiles like they currently are for community discussions. If the api included a count of the comments within the event, the frontend could use the to display the total comment count (which is an indication of activity).

Sometimes there is a lot of activity on events in the form of comments despite the (relatively) low attendee count. For example, you might have 5 attendees, but 10 comments - thus indicating a lot of activity. It is not possible to see the activity/number of comments unless you check out the event. With an api update the fontend could display the comment count on events.

Solution

Add a Add a "X comments" below the attendee count (where X is the number of total comments) to event tiles.

We should be able to use total_num_responses from threads.py to display this.

An example of how this is displayed for community discussions, though on event tiles it would be displayed differently to match the attendee count format, "X attendees" and "X comments":

[nabramow]

@jesseallhands Is this one ready to be picked up? If so do you mind adding the "Ready" status?