MC-5810: Improve naming of the critical variables/parameters in the code and configuration

- Resolved test failure
- Resolved static test failure

Author: Hwashiang Yu

app/code/Magento/PageBuilder/Model/Stage/HtmlFilter.php

@@ -54,7 +54,9 @@ public function filterHtml(string $content): string
             $item->parentNode->removeChild($item);
         }
         $xpath = new \DOMXPath($dom);
-        $htmlContentTypes = $xpath->query('//*[@data-content-type="html" and not(contains(@class, "placeholder-html-code"))]');
+        $htmlContentTypes = $xpath->query(
+            '//*[@data-content-type="html" and not(contains(@class, "placeholder-html-code"))]'
+        );
         foreach ($htmlContentTypes as $htmlContentType) {
             /* @var \DOMElement $htmlContentType */
             $innerHTML= '';

app/code/Magento/PageBuilder/view/adminhtml/web/css/source/_config.less

@@ -4,8 +4,8 @@
 //  */
 
 .error-border (@color) {
-  border: 1px solid @color;
-  overflow: hidden;
+    border: 1px solid @color;
+    overflow: hidden;
 }
 
 [data-role='modal'] {

app/code/Magento/PageBuilder/view/frontend/web/css/source/content-type/block/_default.less

@@ -7,7 +7,7 @@
 //  Default appearance styles
 //  _____________________________________________
 
-[data-content-type='block'] {
+[data-content-type$='block'] {
     .block {
         p:last-child {
             margin-bottom: 1rem;