Add missing require rails helper to recent moved files (#38254)

spec/models/account/avatar_spec.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require 'rails_helper'
+
 RSpec.describe Account::Avatar do
   describe 'static avatars', :attachment_processing do
     describe 'with a square GIF' do

spec/models/account/header_spec.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require 'rails_helper'
+
 RSpec.describe Account::Header do
   describe 'base64-encoded files', :attachment_processing do
     let(:base64_attachment) { "data:image/jpeg;base64,#{Base64.encode64(attachment_fixture('attachment.jpg').read)}" }

spec/models/account/search_spec.rb

@@ -1,5 +1,7 @@
 # frozen_string_literal: true
 
+require 'rails_helper'
+
 RSpec.describe Account::Search do
   describe '.search_for' do
     before do