This enhances two parts of the UI for the new issue verification

feature: The review request infobox and the issues/Ship It dashboard

column.
The review request infobox's status pane now includes the number of

issues pending verification. This is only shown if there are issues

pending verification.
The issues column in the dashboard was previously updated to include the

count in parenthesis, but it wasn't immediately clear what this count

was for. The column has been updated to show the issue verifications

icon alongside the count when there's at least one issue pending

verification. Under the hood, that code has also been updated to be more

centralized and to more easily support additional counters in the

future.

Tested the infobox with review requests with and without issues pending

verification. Saw the icon and count when there were such issues.
Tested all states of the dashboard column.