Rename sdg_related_list to related_sdg_list

To maintain consistency with the current names in the database with fields:
:related_sdg_type and :related_sdg_id

app/components/sdg/related_list_selector_component.html.erb

@@ -1,6 +1,6 @@
 <div class="sdg-related-list-selector">
   <div class="input-section">
-    <%= f.label :sdg_related_list %>
+    <%= f.label :related_sdg_list %>
 
     <ul aria-label="<%= t("sdg.related_list_selector.goal_list") %>">
       <% goals.each do |goal| %>
@@ -10,7 +10,7 @@
       <% end %>
     </ul>
 
-    <%= f.text_field :sdg_related_list,
+    <%= f.text_field :related_sdg_list,
                       class: "input",
                       label: false,
                       placeholder: t("sdg.related_list_selector.placeholder"),