View approval counts in the merge requests list view

Resources

PM @victorwu

Description

• Suppose that merge request approvals are turned on.
• For each entry in the merge requests list view, view the approval counts (how many have approved, how many are needed), as shown in the mockup below, i.e. 1/8 means that 1 person has approved, and there are 8 total required. The checkmark indicates that approvals are necessary.
• The problem is motivated and discussed here: https://gitlab.com/gitlab-org/gitlab-ee/issues/769

Design

Out of scope

• The colors and styling of the numbers and the checkmark are not in scope of for this issue (and covered elsewhere).