RFR: 1859: Add "tags only" option to MirrorBot [v3]

[Erik Joelsson]

On Fri, 31 Mar 2023 12:58:10 GMT, Erik Helin <ehelin at openjdk.org> wrote:

>> Hi all,
>> 
>> please review this patch that adds an option to the `MirrorBot` to mirror only tags from one repository to another. I also added some additional logging to `MirrorBot` and cleaned up the logic a bit for selecting the "mode" (tags, mirror, selected branches) that the `MirrorBot` uses.
>> 
>> ### Testing
>> - [x] Added one additional unit test
>> 
>> Thanks,
>> Erik
>
> Erik Helin has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Remove "exclude" for "tags"

Marked as reviewed by erikj (Lead).

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PR Review: https://git.openjdk.org/skara/pull/1493#pullrequestreview-1366979217