CLDC-4241: use link rather than submit form for see all related answers

app/controllers/form_controller.rb

@@ -47,6 +47,7 @@ class FormController < ApplicationController
         flash[:log_data] = responses_for_page
         question_ids = (@log.errors.map(&:attribute) - [:base]).uniq
         flash[:pages_with_errors_count] = question_ids.map { |id| @log.form.get_question(id, @log)&.page&.id }.compact.uniq.count
+        flash[:related_question_ids] = question_ids.map(&:to_s)
         redirect_to send("#{@log.log_type}_#{@page.id}_path", @log, { referrer: request.params["referrer"], original_page_id: request.params["original_page_id"], related_question_ids: request.params["related_question_ids"] })
       end
     else
@@ -91,13 +92,14 @@ class FormController < ApplicationController
       @pages_with_errors_count = 0
       if @page.routed_to?(@log, current_user) || is_referrer_type?("interruption_screen") || adding_answer_from_check_errors_page?
         if updated_answer_from_check_errors_page?
-          @questions = request.params["related_question_ids"].map { |id| @log.form.get_question(id, @log) }
+          @questions = request.params["related_question_ids"].map { |id| @log.form.get_question(id, @log) }.compact
           render "form/check_errors"
         else
           if flash[:errors].present?
             restore_previous_errors(flash[:errors])
             restore_error_field_values(flash[:log_data])
             @pages_with_errors_count = flash[:pages_with_errors_count]
+            @related_question_ids = flash[:related_question_ids]
           end
           render "form/page"
         end

app/views/form/page.html.erb

@@ -77,7 +77,7 @@
 
       <% if @pages_with_errors_count > 1 %>
         <div class="govuk-button-group">
-          <%= f.submit "See all related answers", class: "govuk-body govuk-link submit-button-link" %>
+          <%= govuk_link_to "See all related answers", send("#{@log.log_type}_#{@page.id}_path", @log, check_errors: true, related_question_ids: @related_question_ids) %>
         </div>
       <% end %>