RFR: 1706: Store github checks in PR unique way [v2]

[Zhao Song]

On Fri, 10 Feb 2023 14:13:21 GMT, Erik Joelsson <erikj at openjdk.org> wrote:

> > From the link you provided, I notice there are three items `jcheck`, `jcheck-openjdk/playground-125` and `jcheck-openjdk/playground-126` under the `openjdk`. And the `PR-125`, which is sooner than `PR-126`, also has these three items, please see https://github.com/openjdk/playground/pull/125/checks.
> 
> That's a good point and the kind of thing I wanted to catch by testing it in staging. This is caused by testinfo bot copying all checks from the source branch into the pull request. This copying will need to be filtered so that only the relevant jcheck checks are copied.

Yes, I will make testinfo bot only copy the right jcheck run.

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PR: https://git.openjdk.org/skara/pull/1470