[feature]: Project-level analytics in dashboards

Is there an existing issue for this? • I have searched the existing issues Summary Problem The current dashboard functionality is primarily focused on work items. However, projects themselves are an important overarching data type within a workspace, and there is currently no comparable way to visualize or analyze project-level data over time. The "Analytics" section is just not detailed enough. For teams managing many projects, this makes it difficult to answer questions about the project portfolio as a whole without exporting data or using external reporting tools. Proposed functionality Extend the existing dashboard functionality so that Projects can be used as a data source, in addition to work items. Ideally, dashboard widgets could: • aggregate and count projects • group projects by properties such as labels, state, lead, team, etc. • filter projects by their properties • use project creation/completion dates as a time dimension &…