Extension metrics

[KesterTan]

Description

Previously, an instructor had to go through every homework and manually track the number of extensions requests a student had per course. This change allows instructors to filter students in a course by the number of extensions that was given in Student Metrics.

How Has This Been Tested?

1. Create a new course or use an existing course
2. Upload a few assessments if the course does not have any already
3. Click into an assessment, select manage extensions, and give extensions to any student enrolled in the course.
4. Test it out with different assessments, different students, and different extension lengths (especially try giving the same student an extension in multiple assessments).
5. Select Student Metrics, type in the amount of extensions requests you want to filter for, and click save
6. Check the watchlist to see if students appear in the watchlist. If not, try refreshing the list using the refresh button or manually refreshing the page.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have run rubocop for style check. If you haven't, run overcommit --install && overcommit --sign to use pre-commit hook for linting
• My change requires a change to the documentation, which is located at Autolab Docs
• I have updated the documentation accordingly, included in this PR

[victorhuangwq]

Testing locally

Hover over error

1. Gave User0 1 day extension on Lab0, and User1 2 day extension on Homework2
2. Selected Students who have greater than or equal to 1 extensions.
3. Both students appeared, but the hover over are both wrong

Did not clear out previous metrics / Regression

1. Students who did not submit at least 1 assignment(s)
2. Look at metrics, many students should appear
3. Select Students who have greater than or equal to 1 extensions, and unselect Students who did not submit at least 1 assignment(s)
4. Now you get students who have made 0 extension requests
   .

[victorhuangwq]

On the front end, I am able to set, and also save that

although it seems to be clamped to 1 in the backend.

You should have field validation on the front end to allow only positive integers

[victorhuangwq]

Issue with ability to set to more than or equals to 0 on front end. As well as other nits.

[victorhuangwq]

I don't think you took into account Considered categories when making your calculations:

I excluded Labs, and I get lab categories extensions

[victorhuangwq]

Functionality works as expected. Small nit that was not addressed previously.

LGTM