RFR: 1603: Make labels handling consistent in all Issue implementations

[Zhao Song]

On Fri, 30 Sep 2022 20:18:42 GMT, Zhao Song <duke at openjdk.org> wrote:

> Make TestIssue and JiraIssue update the cache when updating labels.

issuetracker/src/main/java/org/openjdk/skara/issuetracker/jira/JiraIssue.java line 306:

> 304:                     .map(s -> new Label(s.asString()))
> 305:                     .collect(Collectors.toList());
> 306:         }

I tried to just update the labels but I could not make it. So I update the json first and then update the labels.

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PR: https://git.openjdk.org/skara/pull/1387