Migrate checkbox to GitLab UI component

app/views/shared/deploy_keys/_project_group_form.html.haml

-= form_for [@project.namespace, @project, @deploy_keys.new_key], url: namespace_project_deploy_keys_path, html: { class: "js-requires-input container" } do |f|
+= gitlab_ui_form_for [@project.namespace, @project, @deploy_keys.new_key], url: namespace_project_deploy_keys_path, html: { class: "js-requires-input container" } do |f|
   = form_errors(@deploy_keys.new_key)
   .form-group.row
     = f.label :title, class: "label-bold"
@@ -13,12 +13,8 @@
 
   = f.fields_for :deploy_keys_projects do |deploy_keys_project_form|
     .form-group.row
-      = deploy_keys_project_form.label :can_push do
-        = deploy_keys_project_form.check_box :can_push
-        %strong= _('Grant write permissions to this key')
-    .form-group.row
-      %p.light.gl-mb-0
-        = _('Allow this key to push to this repository')
+      = deploy_keys_project_form.gitlab_ui_checkbox_component :can_push, _('Grant write permissions to this key'),
+        help_text: _('Allow this key to push to this repository')
 
   .form-group.row
     = f.submit _("Add key"), class: "btn gl-button btn-confirm", data: { qa_selector: "add_deploy_key_button"}