Simplify setting up admin component tests

spec/components/admin/budgets/actions_component_spec.rb

@@ -1,8 +1,7 @@
 require "rails_helper"
 
-describe Admin::Budgets::ActionsComponent, controller: Admin::BaseController do
+describe Admin::Budgets::ActionsComponent, :admin do
   include Rails.application.routes.url_helpers
-  before { sign_in(create(:administrator).user) }
 
   let(:budget) { create(:budget) }
   let(:component) { Admin::Budgets::ActionsComponent.new(budget) }

spec/components/admin/budgets/calculate_winners_button_component_spec.rb

@@ -1,9 +1,8 @@
 require "rails_helper"
 
-describe Admin::Budgets::CalculateWinnersButtonComponent, controller: Admin::BaseController do
+describe Admin::Budgets::CalculateWinnersButtonComponent, :admin do
   let(:budget) { create(:budget) }
   let(:component) { Admin::Budgets::CalculateWinnersButtonComponent.new(budget) }
-  before { sign_in(create(:administrator).user) }
 
   it "renders when reviewing ballots" do
     budget.update!(phase: "reviewing_ballots")

spec/components/admin/budgets/links_component_spec.rb

@@ -1,8 +1,6 @@
 require "rails_helper"
 
-describe Admin::Budgets::LinksComponent, controller: Admin::BaseController do
-  before { sign_in(create(:administrator).user) }
-
+describe Admin::Budgets::LinksComponent, :admin do
   describe "see results link" do
     let(:budget) { create(:budget, :finished) }
     let(:component) { Admin::Budgets::LinksComponent.new(budget) }

spec/components/admin/budgets/table_actions_component_spec.rb

@@ -1,6 +1,6 @@
 require "rails_helper"
 
-describe Admin::Budgets::TableActionsComponent, controller: Admin::BaseController do
+describe Admin::Budgets::TableActionsComponent, :admin do
   let(:budget) { create(:budget) }
   let(:component) { Admin::Budgets::TableActionsComponent.new(budget) }