feat: property information numbering

app/models/form/sales/questions/property_building_type.rb

@@ -6,6 +6,7 @@ class Form::Sales::Questions::PropertyBuildingType < ::Form::Question
     @header = "What type of building is the property?"
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
+    @question_number = 13
   end
 
   ANSWER_OPTIONS = {

app/models/form/sales/questions/property_number_of_bedrooms.rb

@@ -9,5 +9,6 @@ class Form::Sales::Questions::PropertyNumberOfBedrooms < ::Form::Question
     @width = 10
     @min = 1
     @max = 9
+    @question_number = 11
   end
 end

app/models/form/sales/questions/property_unit_type.rb

@@ -6,6 +6,7 @@ class Form::Sales::Questions::PropertyUnitType < ::Form::Question
     @header = "What type of unit is the property?"
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
+    @question_number = 12
   end
 
   ANSWER_OPTIONS = {

app/models/form/sales/questions/property_wheelchair_accessible.rb

@@ -6,6 +6,7 @@ class Form::Sales::Questions::PropertyWheelchairAccessible < ::Form::Question
     @header = "Is the property build or adapted to wheelchair-user standards?"
     @type = "radio"
     @answer_options = ANSWER_OPTIONS
+    @question_number = 17
   end
 
   ANSWER_OPTIONS = {