fix aria warning

src/registrar/templates/admin/search_form.html

@@ -0,0 +1,26 @@
+{% comment %} This is an override of the django search bar to add better accessibility compliance.
+There are no blocks defined here, so we had to copy the code. 
+https://github.com/django/django/blob/main/django/contrib/admin/templates/admin/search_form.html
+{% endcomment %}
+{% load i18n static %}
+{% if cl.search_fields %}
+<div id="toolbar"><form id="changelist-search" method="get" role="search">
+<div><!-- DIV needed for valid HTML -->
+{% comment %} .gov override - removed for="searchbar" {% endcomment %}
+<label><img src="{% static "admin/img/search.svg" %}" alt="Search"></label>
+<input type="text" size="40" name="{{ search_var }}" value="{{ cl.query }}" id="searchbar"{% if cl.search_help_text %} aria-describedby="searchbar_helptext"{% endif %}>
+<input type="submit" value="{% translate 'Search' %}">
+{% if show_result_count %}
+    <span class="small quiet">{% blocktranslate count counter=cl.result_count %}{{ counter }} result{% plural %}{{ counter }} results{% endblocktranslate %} (<a href="?{% if cl.is_popup %}{{ is_popup_var }}=1{% if cl.add_facets %}&{% endif %}{% endif %}{% if cl.add_facets %}{{ is_facets_var }}{% endif %}">{% if cl.show_full_result_count %}{% blocktranslate with full_result_count=cl.full_result_count %}{{ full_result_count }} total{% endblocktranslate %}{% else %}{% translate "Show all" %}{% endif %}</a>)</span>
+{% endif %}
+{% for pair in cl.params.items %}
+    {% if pair.0 != search_var %}<input type="hidden" name="{{ pair.0 }}" value="{{ pair.1 }}">{% endif %}
+{% endfor %}
+</div>
+{% if cl.search_help_text %}
+<br class="clear">
+{% comment %} .gov override - added for="searchbar" {% endcomment %}
+<label class="help" id="searchbar_helptext" for="searchbar">{{ cl.search_help_text }}</label>
+{% endif %}
+</form></div>
+{% endif %}