ISTWCMS-2443: Updating preprocess for alt value and sending alt value in template

templates/paragraphs/paragraph--uw-para-marketing-block.html.twig

@@ -15,6 +15,10 @@
  *   or print a subset such as {{ content.field_example }}. Use
  *   {{ content|without('field_example') }} to temporarily suppress the printing
  *   of a given child element.
+ * - sources: The attributes of the <source> tags for this <picture> tag.
+ * - img_element: The controlling image, with the fallback image in srcset.
+ * - output_image_tag: Whether or not to output an <img> tag instead of a
+ *   <picture> tag.
  * - attributes: HTML attributes for the containing element.
  *   The attributes.class element may contain one or more of the following
  *   classes:
@@ -43,5 +47,6 @@
   "sources": sources,
   "marketing_text": content.field_uw_marketing_text|field_value.0['#text'],
   "output_image_tag": output_image_tag,
-  "img_element": img_element
+  "img_element": img_element['#uri'],
+  "alt": alt
 } %}

uw_fdsu_theme_resp.theme

@@ -60,6 +60,9 @@ function _uw_fdsu_theme_resp_add_responsive_image_variables(&$variables, $field_
   // Get the field entity from the paragraph.
   $field = $variables['paragraph']->get($field_name)->first();
 
+  // Set the alt tag from the field entity.
+  $variables['alt'] = $field->get('alt')->getValue();
+
   // Set the file entity based on the field name.
   $file = $field->entity;