Resolve "Assignment request count broken on stats page"

What does this mr do?

The bug was that the function used to retrieve the associated values to the keys were returning undefined entries. This was changed by deconstructing the object into an array of keys and values simultaneously.

Screenshots

Does this MR meet the acceptance criteria?

• I have added a changelog entry to reflect the significant changes I made and the bug I fixed.
• A test was created to test the bug. ~ test not needed otherwise we couple to frontend (stuff like bar graph color)
• I have updated the documentation accordingly.
• I adhere to the style guide.

Closes #664 (closed)