git: openjdk/skara: pr: add /clean command

[Erik Helin]

Changeset: c2e2aded
Author:    Erik Helin <ehelin at openjdk.org>
Date:      2021-02-19 13:01:14 +0000
URL:       https://git.openjdk.java.net/skara/commit/c2e2aded

pr: add /clean command

Reviewed-by: rwestberg

! bots/pr/src/main/java/org/openjdk/skara/bots/pr/CheckRun.java
+ bots/pr/src/main/java/org/openjdk/skara/bots/pr/CleanCommand.java
! bots/pr/src/main/java/org/openjdk/skara/bots/pr/CommandWorkItem.java
+ bots/pr/src/test/java/org/openjdk/skara/bots/pr/CleanCommandTests.java
! cli/src/main/java/org/openjdk/skara/cli/pr/GitPrSet.java