Issue #3176912 by anmolgoyal74, Abhijith S, sarvjeetsingh, mherchel: Missing...

Issue #3176912 by anmolgoyal74, Abhijith S, sarvjeetsingh, mherchel: Missing variables in Olivero's block--secondary-menu--plugin-id--search-form-block.html.twig

(cherry picked from commit 2bdcc0f6)

core/themes/olivero/templates/block/block--secondary-menu--plugin-id--search-form-block.html.twig

@@ -7,6 +7,14 @@
  * - content: The content of this block.
  * - content_attributes: A list of HTML attributes applied to the main content
  *   tag that appears in the template.
+ * - label: The configured label of the block if visible.
+ * - attributes: HTML attributes for the wrapper.
+ * - title_attributes: Same as attributes, except applied to the main title
+ *   tag that appears in the template.
+ * - title_prefix: Additional output populated by modules, intended to be
+ *   displayed in front of the main title tag that appears in the template.
+ * - title_suffix: Additional output populated by modules, intended to be
+ *   displayed after the main title tag that appears in the template.
  *
  * @see template_preprocess_block()
  * @see search_preprocess_block()