RFR: 1817: 'WIP merge requests' renamed to 'draft merge requests' in GitLab

[Erik Joelsson]

On Mon, 13 Feb 2023 22:56:46 GMT, Zhao Song <zsong at openjdk.org> wrote:

> Since 'WIP' is deprecated in GitLab, we need to update methods related with 'WIP'.

Marked as reviewed by erikj (Lead).

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PR: https://git.openjdk.org/skara/pull/1472