Replaced the custom controller for fragment replacements with symfony streams

This does not require a complete new endpoint

templates/_turbo_control.html.twig

@@ -1,14 +1,20 @@
-{# Insert flashes #}
-<div class="toasts-global d-none">
-    {% for label, messages in app.flashes() %}
-        {% for message in messages %}
-            {{ include('_toast.html.twig', {
-                'label': label,
-                'message': message
-            }) }}
-        {% endfor %}
-    {% endfor %}
-</div>
+{% block flashes %}
+    {# Insert flashes #}
+    <turbo-stream action="replace" action="morph" target="toast-container">
+        <template>
+            <div class="toast-container" id="toast-container">
+                {% for label, messages in app.flashes() %}
+                    {% for message in messages %}
+                        {{ include('_toast.html.twig', {
+                            'label': label,
+                            'message': message
+                        }) }}
+                    {% endfor %}
+                {% endfor %}
+            </div>
+        </template>
+    </turbo-stream>
+{% endblock %}
 
 {# Allow pages to request a fully reload of everything #}
 {% if global_reload_needed is defined and global_reload_needed %}