Throughput Analytics: Filter controls [FE]

Problem to solve

The Throughput Analytics feature (introduced under #229045 (closed)) is not very useful without the ability to apply filters that scope your perspective of the data.

Proposal

The Throughput Analytics feature should have a filter bar similar to Value Stream Analytics, which allows for filtering Merge Requests by:

• Assignee
• Author
• Labels
• Milestone
• Branch

Datepicker is covered in #229375 (closed) and we'll use a fixed timeframe until that issue is worked on.