Extract component to show moderation actions

Note that in proposal notifications we're writing the call to
render the component in the same line as the <div class="reply">
definition in order to be able to use the `:empty` selector when the
component renders nothing. No browser matches whitespace with the
`:empty` selector, so we can't add newline characters inside the tag. A
more elegant solution would be extracting the proposal notification
actions to a component and only rendering it if the moderation actions
component is rendered.

app/views/debates/_actions.html.erb

@@ -1,13 +1,4 @@
-<% if can? :hide, debate %>
-  <%= link_to t("admin.actions.hide").capitalize, hide_moderation_debate_path(debate),
-              method: :put, remote: true, data: { confirm: t("admin.actions.confirm_action", action: t("admin.actions.hide"), name: debate.title) } %>
-<% end %>
-
-<% if can? :hide, debate.author %>
-  &nbsp;|&nbsp;
-  <%= link_to t("admin.actions.hide_author").capitalize, hide_moderation_user_path(debate.author_id),
-              method: :put, data: { confirm: t("admin.actions.confirm_action", action: t("admin.actions.hide_author"), name: debate.author.name) } %>
-<% end %>
+<%= render Shared::ModerationActionsComponent.new(debate) %>
 
 <% if can? :mark_featured, debate %>
   &nbsp;|&nbsp;