RFR: Improve logging in PR bot

[Kevin Rushforth]

On Thu, 4 Aug 2022 13:52:40 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> This very minor patch adds the repo names to log messages in `getPeriodicItems()`. I'm going to look into performance issues with the bots, and just seeing a bunch of
> 
> 
> Fetching all open pull requests
> Fetching all open pull requests
> 
> 
> in the log without any further context isn't helping.
> 
> I also stumbled over an unused import as well as a bad use of LinkedList while in the area.

Marked as reviewed by kcr (Reviewer).

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PR: https://git.openjdk.org/skara/pull/1347