Remove "reference" from ListService issues

app/services/related_issues/list_service.rb

@@ -12,7 +12,6 @@ module RelatedIssues
           title: referenced_issue.title,
           iid: referenced_issue.iid,
           state: referenced_issue.state,
-          reference: referenced_issue.to_reference(@issue.project),
           project_full_path: referenced_issue.project.full_path,
           namespace_full_path: referenced_issue.project.namespace.full_path,
           path: namespace_project_issue_path(referenced_issue.project.namespace, referenced_issue.project, referenced_issue.iid),

spec/services/related_issues/list_service_spec.rb

@@ -48,7 +48,6 @@ describe RelatedIssues::ListService, service: true do
             title: issue_b.title,
             iid: issue_b.iid,
             state: issue_b.state,
-            reference: issue_b.to_reference(project),
             path: "/#{project.full_path}/issues/#{issue_b.iid}",
             project_full_path: issue_b.project.full_path,
             namespace_full_path: issue_b.project.namespace.full_path,
@@ -61,7 +60,6 @@ describe RelatedIssues::ListService, service: true do
             title: issue_c.title,
             iid: issue_c.iid,
             state: issue_c.state,
-            reference: issue_c.to_reference(project),
             path: "/#{project.full_path}/issues/#{issue_c.iid}",
             project_full_path: issue_c.project.full_path,
             namespace_full_path: issue_c.project.namespace.full_path,
@@ -74,7 +72,6 @@ describe RelatedIssues::ListService, service: true do
             title: issue_d.title,
             iid: issue_d.iid,
             state: issue_d.state,
-            reference: issue_d.to_reference(project),
             path: "/#{project.full_path}/issues/#{issue_d.iid}",
             project_full_path: issue_d.project.full_path,
             namespace_full_path: issue_d.project.namespace.full_path,