MDL-85200 mod_quiz: Expand behat test to cover shared bank display

This extends the existing behat test for adding a question from a shared
bank to confirm that the source bank is displayed with the question on
the Questions page.

The bank name is already passed through format_string() before being
passed to the template, so additional encoding by the template is not
necessary, hence the template has been changed to use triple braces.

mod/quiz/templates/question_slot.mustache

@@ -58,7 +58,7 @@
         {{#issharedbank}}
             <div class="sharedbank">
                 <a href="{{bankurl}}">
-                    <span class="badge bg-primary text-light ms-2 mt-1">{{bankname}}</span>
+                    <span class="badge bg-primary text-light ms-2 mt-1">{{{bankname}}}</span>
                 </a>
             </div>
         {{/issharedbank}}

mod/quiz/tests/behat/editing_add_from_question_bank.feature

@@ -172,6 +172,7 @@ Feature: Adding questions to a quiz from the question bank
     And I click on "Select" "checkbox" in the "question 03 name" "table_row"
     And I click on "Add selected questions to the quiz" "button"
     And I should see "question 03 name"
+    And "Qbank 1 & < > " "text" should appear after "question 03 name" "text"
 
   @javascript
   Scenario: Validate the sorting while adding questions from question bank