Decide on whether vue bundle render method should use arrow function

This is a follow up discussion from https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/3579#note_50403209

It seems like we have 13 instances of render: createElement => createElement and 24 instances of return createElement. I propose we follow up this discussion in a separate issue so that we can change them all in one swoop.

app/assets/javascripts/issuable/issuable_bundle.js:      render: createElement => createElement('related-issues-root', {
app/assets/javascripts/monitoring/monitoring_bundle.js:  render: createElement => createElement(Dashboard),
app/assets/javascripts/projects/permissions/index.js:    render: createElement => createElement(settingsPanel, { props: { ...componentProps } }),
app/assets/javascripts/sidebar/mount_sidebar.js:    render: createElement => createElement('sidebar-assignees', {
app/assets/javascripts/sidebar/mount_sidebar.js:    render: createElement => createElement('sidebar-participants', {
app/assets/javascripts/sidebar/mount_sidebar.js:    render: createElement => createElement('sidebar-subscriptions', {
app/assets/javascripts/sidebar/mount_sidebar.js:    render: createElement => createElement('sidebar-time-tracking', {}),
doc/development/fe_guide/style_guide_js.md:      render: createElement => createElement('component-name'),
doc/development/fe_guide/vue.md:  render: createElement => createElement('todo-component' {
ee/app/assets/javascripts/epics/epic_show/epic_show_bundle.js:    render: createElement => createElement('epic-show-app', {
ee/app/assets/javascripts/epics/new_epic/new_epic_bundle.js:    render: createElement => createElement('new-epic-app', {
ee/app/assets/javascripts/sidebar/mount_sidebar.js:    render: createElement => createElement('sidebar-weight', {
ee/app/assets/javascripts/sidebar/mount_sidebar.js:    render: createElement => createElement('sidebar-item-epic', {}),

app/assets/javascripts/clusters/clusters_bundle.js:        return createElement('applications', {
app/assets/javascripts/deploy_keys/index.js:    return createElement('deploy-keys-app', {
app/assets/javascripts/environments/environments_bundle.js:    return createElement('environments-component', {
app/assets/javascripts/environments/folder/environments_folder_bundle.js:    return createElement('environments-folder-app', {
app/assets/javascripts/groups/index.js:      return createElement('groups-app', {
app/assets/javascripts/issue_show/index.js:      return createElement('issuable-app', {
app/assets/javascripts/jobs/job_details_bundle.js:      return createElement('job-header', {
app/assets/javascripts/jobs/job_details_bundle.js:      return createElement('details-block', {
app/assets/javascripts/notes/index.js:    return createElement('issue-notes-app', {
app/assets/javascripts/pipeline_schedules/pipeline_schedule_form_bundle.js:      return createElement('interval-pattern-input', {
app/assets/javascripts/pipeline_schedules/pipeline_schedules_index_bundle.js:    return createElement('pipeline-schedules-callout');
app/assets/javascripts/pipelines/pipeline_details_bundle.js:      return createElement('pipeline-graph', {
app/assets/javascripts/pipelines/pipeline_details_bundle.js:      return createElement('pipeline-header', {
app/assets/javascripts/pipelines/pipelines_bundle.js:    return createElement('pipelines-component', {
app/assets/javascripts/profile/account/index.js:    return createElement('delete-account-modal', {
app/assets/javascripts/projects/settings_service_desk/service_desk_bundle.js:        return createElement('service-desk-root', {
app/assets/javascripts/projects_dropdown/index.js:      return createElement('projects-dropdown-app', {
app/assets/javascripts/registry/index.js:    return createElement('registry-app', {
app/assets/javascripts/repo/index.js:      return createElement('repo');
app/assets/javascripts/repo/index.js:      return createElement('repo-edit-button');
app/assets/javascripts/repo/index.js:      return createElement('new-dropdown');
app/assets/javascripts/repo/index.js:      return createElement('new-branch-form');
doc/development/fe_guide/vue.md:    return createElement('my-component', {
doc/development/fe_guide/vue.md:    return createElement('my-component', {