MDL-85467 core: Replace orphaned label with span for accessibility

This commit replaces orphaned labels with spans for improved
accessibility. It also updates the XPATH partial named selector
for select_menu fields to target span elements.

group/templates/comboboxsearch/group_selector.mustache

@@ -34,9 +34,9 @@
 <span class="d-none" data-region="groupid" data-groupid="{{group}}"></span>
 <div class="align-items-center d-flex">
     <div class="d-block pe-3 text-truncate">
-        <label class="d-block m-0 small" aria-hidden="true">
+        <span class="d-block m-0 small" aria-hidden="true">
             {{label}}
-        </label>
+        </span>
         <span class="p-0 font-weight-bold" data-selected-option>
             {{selectedgroup}}
         </span>

lib/behat/classes/partial_named_selector.php

@@ -338,7 +338,7 @@ XPATH
 XPATH
         ,
             'select_menu' => <<<XPATH
-//*[@role='combobox'][@aria-labelledby = //label[contains(normalize-space(string(.)), %locator%)]/@id]
+//*[@role='combobox'][@aria-labelledby = //span[contains(normalize-space(string(.)), %locator%)]/@id]
 XPATH
         ,
         ],

lib/templates/select_menu.mustache

@@ -86,7 +86,7 @@
 }}
 <div class="dropdown select-menu" id="{{baseid}}">
     {{#label}}{{^inlinelabel}}
-        <label id="{{baseid}}-label"{{#labelattributes}} {{name}}="{{value}}"{{/labelattributes}}>{{label}}</label>
+        <span id="{{baseid}}-label"{{#labelattributes}} {{name}}="{{value}}"{{/labelattributes}}>{{label}}</span>
     {{/inlinelabel}}{{/label}}
     <div
         class="btn dropdown-toggle{{#inlinelabel}} d-flex text-left align-items-center p-0{{/inlinelabel}}"
@@ -102,7 +102,7 @@
         {{#inlinelabel}}
             <div class="pr-3 text-truncate">
                 {{#label}}
-                    <label class="d-block m-0 small" id="{{baseid}}-label"{{#labelattributes}} {{name}}="{{value}}"{{/labelattributes}}>{{label}}</label>
+                    <span class="d-block m-0 small" id="{{baseid}}-label"{{#labelattributes}} {{name}}="{{value}}"{{/labelattributes}}>{{label}}</span>
                 {{/label}}
                 <span class="font-weight-bold" data-selected-option>
                     {{selectedoption}}