chore(bower): minor refactor to DRY

The REPOS list was duplicated in publish.sh and unpublish.sh but had
different orderings of the repos.  This commit consolidates the list
into a common include file so that they are always in sync.  We could
improve the scripts a lot more but that's not in the current scope (this
is all I need to scratch my current itch.)

Closes #11605