Issues Analytics: Add closed issues to table

Problem to solve

• Issues analytics only shows opened issues - this information isn't too valuable by itself.
• Related to Q3 Dogfooding OKR

Intended users

• Parker (Product Manager)
• Delaney (Development Team Lead)

Proposal

• Add at project-level
• Add closed issues content to data table Already done here: !38906 (merged)
• Convert the issues table to using GraphQL to fetch issues: https://gitlab.com/gitlab-org/gitlab/-/blob/master/ee/app/assets/javascripts/issues_analytics/components/issues_analytics_table.vue#L115-126
• Add iteration column to data table

Links / references