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.

spec/components/shared/moderation_actions_component_spec.rb

@@ -0,0 +1,56 @@
+require "rails_helper"
+
+describe Shared::ModerationActionsComponent do
+  include Rails.application.routes.url_helpers
+  before { sign_in(create(:administrator).user) }
+
+  describe "Hide link" do
+    it "is shown for debates" do
+      debate = create(:debate)
+
+      render_inline Shared::ModerationActionsComponent.new(debate)
+
+      expect(page).to have_link "Hide", href: hide_moderation_debate_path(debate)
+    end
+
+    it "is shown for proposals" do
+      proposal = create(:proposal)
+
+      render_inline Shared::ModerationActionsComponent.new(proposal)
+
+      expect(page).to have_link "Hide", href: hide_moderation_proposal_path(proposal)
+    end
+
+    it "is shown for proposal notifications" do
+      notification = create(:proposal_notification)
+
+      render_inline Shared::ModerationActionsComponent.new(notification)
+
+      expect(page).to have_link "Hide", href: hide_moderation_proposal_notification_path(notification)
+    end
+
+    it "is shown for comments" do
+      comment = create(:comment)
+
+      render_inline Shared::ModerationActionsComponent.new(comment)
+
+      expect(page).to have_link "Hide", href: hide_moderation_comment_path(comment)
+    end
+
+    it "is shown for budget investments" do
+      investment = create(:budget_investment)
+
+      render_inline Shared::ModerationActionsComponent.new(investment)
+
+      expect(page).to have_link "Hide", href: hide_moderation_budget_investment_path(investment)
+    end
+
+    it "is shown for legislation proposals" do
+      proposal = create(:legislation_proposal)
+
+      render_inline Shared::ModerationActionsComponent.new(proposal)
+
+      expect(page).to have_link "Hide", href: hide_moderation_legislation_proposal_path(proposal)
+    end
+  end
+end