Resolve "gitlab_project_share_group resource not properly refreshed"

Closes #1353 (closed)

internal/provider/sdk/resource_gitlab_project_share_group_test.go

@@ -103,8 +103,8 @@ func TestAccGitlabProjectShareGroup_modifiedOutsideTerraform(t *testing.T) {
 				Check: func(s *terraform.State) error {
 
 					// Remove the project share group since we're simulating removing it between steps.
-					testutil.TestGitlabClient.Projects.DeleteSharedProjectFromGroup(project.ID, group.ID, nil)
-					return nil
+					_, err := testutil.TestGitlabClient.Projects.DeleteSharedProjectFromGroup(project.ID, group.ID, nil)
+					return err
 				},
 			},
 			{