add Previous Bedrooms page to the shared ownership subsection

app/models/form/sales/subsections/shared_ownership_scheme.rb

@@ -10,6 +10,7 @@ class Form::Sales::Subsections::SharedOwnershipScheme < ::Form::Subsection
   def pages
     @pages ||= [
       Form::Sales::Pages::Staircase.new(nil, nil, self),
+      Form::Sales::Pages::PreviousBedrooms.new(nil, nil, self),
     ]
   end
 

spec/models/form/sales/subsections/shared_ownership_scheme_spec.rb

@@ -15,6 +15,7 @@ RSpec.describe Form::Sales::Subsections::SharedOwnershipScheme, type: :model do
     expect(shared_ownership_scheme.pages.map(&:id)).to eq(
       %w[
         staircasing
+        previous_bedrooms
       ],
     )
   end

spec/models/form_handler_spec.rb

@@ -52,14 +52,14 @@ RSpec.describe FormHandler do
     it "is able to load a current sales form" do
       form = form_handler.get_form("current_sales")
       expect(form).to be_a(Form)
-      expect(form.pages.count).to eq(69)
+      expect(form.pages.count).to eq(70)
       expect(form.name).to eq("2022_2023_sales")
     end
 
     it "is able to load a previous sales form" do
       form = form_handler.get_form("previous_sales")
       expect(form).to be_a(Form)
-      expect(form.pages.count).to eq(69)
+      expect(form.pages.count).to eq(70)
       expect(form.name).to eq("2021_2022_sales")
     end
   end