gitlab list MRs: return all, not just 20 (#819)

gitlab list MRs: return all, not just 20

TODO:

 requre


python-gitlab==3.14.0

Calling a `list()` method without specifying `get_all=True` or
`iterator=True` will return a maximum of 20 items. Your query returned
20 of 87 items.

RELEASE NOTES BEGIN
Fixed an issue where getting a list of GitLab merge requests using .list() would return only 20 items.
RELEASE NOTES END

Reviewed-by: František Lachman <flachman@redhat.com>
Reviewed-by: Matej Focko

ogr/services/gitlab/pull_request.py

@@ -240,10 +240,14 @@ def get_list(
         status: PRStatus = PRStatus.open,
     ) -> list["PullRequest"]:
         # Gitlab API has status 'opened', not 'open'
+        # f"Calling a `list()` method without specifying `get_all=True` or "
+        # f"`iterator=True` will return a maximum of 20 items. "
         mrs = project.gitlab_repo.mergerequests.list(
             state=status.name if status != PRStatus.open else "opened",
             order_by="updated_at",
             sort="desc",
+            # gitlab 3.3 syntax was all=True
+            get_all=True,
         )
         return [GitlabPullRequest(mr, project) for mr in mrs]