Feature Request: See "Checks" status on PRs page

[RothAndrew]

As a user of the PRs page on the Pull Reminders site, I'd like to see the Checks status of each PR, so that I can easily determine which PRs are ready to merge or need additional work.

Suggested Acceptance Criteria:

1. For each row:
   1. If the Checks are all successful, the github-style green check mark is displayed
   2. If any of the checks are failed, the github-style red "X" is displayed
   3. If any of the checks are pending, but none are failed, the github-style yellow circle is displayed
   4. If the PR isn't reporting any checks, nothing is displayed

Example from Github Pull Requests page:

[abinoda]

Adding to backlog