Staff: see grading run stats for assignments

[shreyas208]

No description provided.

[ayushr2]

Ideally we have a /staff/course/<course-id>/<assignment-id>/ page which has the following components:

• Stats: To start off we need some basic stats like a table or list with total number of runs that were triggered for this assignment on a per day basis. Stretch goal is to have a histogram for each day which shows how many people requested AG runs per hour.
• Grading Run History: We will have 2 nested collapsible sections. The outer most section has two components: Staff, Students. If you click on either, it expands to the next collapsible section. Each compoent in this section has a net-id on it (staff's or student's respectectively). Clicking on this component expands it to display a list of runs triggered by this person with the run status and time stamp.

On the /staff/course/<course-id>/ page we have a table of assignments and their details. We should also add a column for total number of runs that have started for that assignment in total.

[shreyas208]

Since we already have run history now, renaming this to focus on the stats part.