RFR: 1256: Use stream api to simplify the csr issue lookup [v3]

[Magnus Ihse Bursie]

On Wed, 1 Dec 2021 08:00:15 GMT, Guoxiong Li <gli at openjdk.org> wrote:

>> Hi all,
>> 
>> This patch adds the common methods `Issue#linksWithRelationships`, `Issue#csrLink` and `Issue#csrIssue` and refactors the code to reduce the loop nested statements by using these common methods.
>> 
>> All the existing tests passed.
>> 
>> Best Regards,
>> -- Guoxiong
>
> Guoxiong Li has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Improve the encapsulation and use the methods of the 'Optional' instead of direct null check

bots/pr/src/main/java/org/openjdk/skara/bots/pr/CheckRun.java line 139:

> 137:             return Optional.empty();
> 138:         }
> 139:         var csr = jbsIssue.get().links().stream()

... and here as well. It's really unfortunate that we have no good framework for where to place such common functionality. :-(

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PR: https://git.openjdk.java.net/skara/pull/1248