RFR: 1242: The /clean command for backports is ignored

[Magnus Ihse Bursie]

On Wed, 17 Nov 2021 14:22:03 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> When dealing with backport pull requests, Skara tries to automatically determine if the backport is "clean". This automatic check is rather picky, so the user is supposed to be able to override this result with the command "/clean". Issuing the command works so far as the bot will react to it and add the "clean" label, but then it will ignore the label and still not consider the pull request clean.
> 
> This patch fixes this and updates the test to also verify that the pull request gets the "ready" label.

Marked as reviewed by ihse (Reviewer).

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PR: https://git.openjdk.java.net/skara/pull/1239