MC-2371: Implement full width layout for CMS pages

- Update layout name to use dashes

Author: davemacaulay

app/code/Magento/PageBuilder/view/frontend/layouts.xml

@@ -6,7 +6,7 @@
  */
 -->
 <page_layouts xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/PageLayout/etc/layouts.xsd">
-    <layout id="cms_full_width">
+    <layout id="cms-full-width">
         <label translate="true">CMS - Full Width</label>
     </layout>
     <layout id="category-full-width">

app/code/Magento/PageBuilder/view/frontend/page_layout/cms_full_width.xml renamed to app/code/Magento/PageBuilder/view/frontend/page_layout/cms-full-width.xml

@@ -57,4 +57,4 @@
 //  Page Layouts
 //  _____________________________________________
 
-@import 'layouts/_import.less';
+@import 'layout/_import.less';

app/code/Magento/PageBuilder/view/frontend/web/css/source/_module.less

@@ -3,7 +3,7 @@
 //  * See COPYING.txt for license details.
 //  */
 
-.page-layout-cms_full_width .page-main {
+.page-layout-cms-full-width .page-main {
     max-width: 100%;
     padding-left: 0;
     padding-right: 0;