Resolve "CSV export of lab: column header"

What does this mr do?

Resolves #344 (closed) if this was the desired result.

Actions taken to fix bug

Renamed inaccurate Net ID header to Student number and added field Student name as requested in issue.

Before

"Net ID","Created at","Handled at","Slot starts at","Slot ends at",Status,"TU Delft Queue URL"
1876018518,2020-06-25T18:23:15.965,,,,PENDING,"queue.tudelft.nl/request/26"
1876018519,2020-06-25T18:23:15.966,,,,PENDING,"queue.tudelft.nl/request/27"
1876018520,2020-06-25T18:23:15.967,,,,PENDING,"queue.tudelft.nl/request/28"
1876018521,2020-06-25T18:23:15.967,,,,PENDING,"queue.tudelft.nl/request/29"

After

"Student number","Student name","Created at","Handled at","Slot starts at","Slot ends at",Status,"TU Delft Queue URL"
1876018518,student1,2020-06-25T19:07:48.997,,,,PENDING,"queue.tudelft.nl/request/26"
1876018519,student2,2020-06-25T19:07:48.998,,,,PENDING,"queue.tudelft.nl/request/27"
1876018520,student3,2020-06-25T19:07:48.998,,,,PENDING,"queue.tudelft.nl/request/28"
1876018521,student4,2020-06-25T19:07:48.999,,,,PENDING,"queue.tudelft.nl/request/29"

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.
• I have updated the documentation accordingly.
• I adhere to the style guide.