gitlab: use gitlab instance runner to create runner (#3965) (#4122)

When using project it will use project level runner to create runner that based on python-gitlab it will be used for enabling runner and needs a runner_id so for creating a new runner it should use gitlab level runner

Signed-off-by: Seena Fallah <seenafallah@gmail.com>
(cherry picked from commit 929136808f)

Co-authored-by: Seena Fallah <seenafallah@gmail.com>

changelogs/fragments/3935-use-gitlab-instance-runner-to-create-runner.yml

@@ -0,0 +1,2 @@
+bugfixes:
+  - 'gitlab_runner - use correct API endpoint to create and retrieve project level runners when using ``project`` (https://github.com/ansible-collections/community.general/pull/3965).'

plugins/modules/source_control/gitlab/gitlab_runner.py

@@ -249,7 +249,7 @@ class GitLabRunner(object):
             return True
 
         try:
-            runner = self._runners_endpoint.create(arguments)
+            runner = self._gitlab.runners.create(arguments)
         except (gitlab.exceptions.GitlabCreateError) as e:
             self._module.fail_json(msg="Failed to create runner: %s " % to_native(e))
 
@@ -293,10 +293,10 @@ class GitLabRunner(object):
             # object, so we need to handle both
             if hasattr(runner, "description"):
                 if (runner.description == description):
-                    return self._runners_endpoint.get(runner.id)
+                    return self._gitlab.runners.get(runner.id)
             else:
                 if (runner['description'] == description):
-                    return self._runners_endpoint.get(runner['id'])
+                    return self._gitlab.runners.get(runner['id'])
 
     '''
     @param description Description of the runner