[VSA][FE] Migrate the project level filters to use the group level filter bar

Currently, project-level VSA supports only filtering by a fixed date range via a dropdown.

Let's introduce the same filter capabilities on project-level that we already have on group-level:

  • Introduce a filter bar for
    • milestone
    • label
    • author
    • assignee
  • Migrate the existing date range dropdown to a datepicker
  • Hide the project filter
Edited by Martin Wortschack