Resolve Amount of requests per TA In a single lab + the time taken since the last lab.

What does this mr do?

Introduction of a new table within the stats page for a lab, which allows managers to see the overview of:

• How many requests taken for a single TA
• The time taken since the last request

Screenshots

Does this MR meet the acceptance criteria?

• I have added a changelog entry to reflect the significant changes I made.
• Tests were created to test the feature.
• I have updated the documentation accordingly.
• I adhere to the style guide.

Closes #588 (closed)