CLDC-4141: use prefers not to say text in cya page (#3176)

* CLDC-4141: use prefers not to say text in cya page

* CLDC-4141: update csv service to actually use new labels

* CLDC-4141: reformat complex condition for readability

* CLDC-4141: update csv export tests

* CLDC-4141: revert changes to csv service

* CLDC-4141: use label_from_value to override CYA values

* CLDC-4141: update question tests

* CLDC-4141: update expected exports

* CLDC-4141: update export spec

app/models/form/lettings/questions/lead_tenant_sex_registered_at_birth.rb

@@ -16,4 +16,12 @@ class Form::Lettings::Questions::LeadTenantSexRegisteredAtBirth < ::Form::Questi
   }.freeze
 
   QUESTION_NUMBER_FROM_YEAR = { 2026 => 31 }.freeze
+
+  def label_from_value(value, _log = nil, _user = nil)
+    return unless value
+
+    return "Prefers not to say" if value == "R"
+
+    super
+  end
 end

app/models/form/lettings/questions/person_sex_registered_at_birth.rb

@@ -20,4 +20,12 @@ class Form::Lettings::Questions::PersonSexRegisteredAtBirth < ::Form::Question
 
     base_question_number + (5 * @person_index)
   end
+
+  def label_from_value(value, _log = nil, _user = nil)
+    return unless value
+
+    return "Prefers not to say" if value == "R"
+
+    super
+  end
 end