Integrated: 1611: Improve adding and removing of labels in GitLab

[Zhao Song]

On Wed, 12 Oct 2022 20:59:07 GMT, Zhao Song <zsong at openjdk.org> wrote:

> Improved adding and removing of labels in GitLabMergeRequest.
> 
> And make the label handling consistent with GitHubPullRequest.

This pull request has now been integrated.

Changeset: 62507be4
Author:    Zhao Song <zsong at openjdk.org>
Committer: Erik Joelsson <erikj at openjdk.org>
URL:       https://git.openjdk.org/skara/commit/62507be4ce6dbf2f2cfae3c09e4b781bf7f2b320
Stats:     53 lines in 2 files changed: 36 ins; 12 del; 5 mod

1611: Improve adding and removing of labels in GitLab

Reviewed-by: erikj

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PR: https://git.openjdk.org/skara/pull/1396