[BUILD] Test closing stale PRs

## What changes were proposed in this pull request?

Here I'm seeing if we can close stale PRs via a PR message, as I'd expect.
See thread https://www.mail-archive.com/devspark.apache.org/msg14149.html

Closes #9354
Closes #9451
Closes #10507
Closes #10486
Closes #10460
Closes #10967
Closes #10681
Closes #11766
Closes #9907
Closes #10209
Closes #10379
Closes #10403
Closes #10842
Closes #11036
Closes #13003
Closes #10887

## How was this patch tested?

(No changes)

Author: Sean Owen <sowen@cloudera.com>

Closes #13052 from srowen/TestClosingPRs.