Searching students in grade view is broken
Searching student relies using the grade navigation in the grade view relies on the front-end having the full student data available for each submission. This data is requested from the `api/exams/<exam_id>/?only_metadata=true` endpoint in the `Grade` component, but since commit a8e6e83708912687dfbf445c0f0b6e09547fb290, this no longer returns the full student data per submission, just the submission id and student id.
**_Note: this only applies to exams which have anonymous grading set to false._**
I see two options:
1. Add the student names back to the exam metadata endpoint. (How large is the performance impact?)
2. Add a separate API call in the grade navigation endpoint once it is focused, which loads the student names. Could add `only_metadata` option to the `api/submissions/<exam_id>` endpoint, which excludes solution data.
issue