Placeholder for "Number of employees" in trial

Changelog: changed
EE: true

ee/app/helpers/ee/trial_helper.rb

@@ -2,9 +2,9 @@
 
 module EE
   module TrialHelper
-    def company_size_options_for_select(selected = 0)
+    def company_size_options_for_select(selected = '')
       options_for_select([
-        [_('Please select'), 0],
+        [_('Please select'), ''],
         ['1 - 99', '1-99'],
         ['100 - 499', '100-499'],
         ['500 - 1,999', '500-1,999'],

ee/app/views/shared/groups/_trial_form.html.haml

@@ -15,7 +15,7 @@
   .row
     .form-group.col-sm-12.gl-select2-html5-required-fix
       = label_tag :company_size, s_('Trial|Number of employees'), for: :company_size, class: 'col-form-label'
-      = select_tag :company_size, company_size_options_for_select(params[:company_size]), include_blank: true, class: 'js-trial-field select2', required: true
+      = select_tag :company_size, company_size_options_for_select(params[:company_size]), class: 'js-trial-field select2', required: true
   .row
     .form-group.col-sm-12
       = label_tag :number_of_users, s_('Trial|How many employees will use Gitlab?'), for: :number_of_users, class: 'col-form-label'

ee/app/views/trials/new.html.haml

@@ -40,7 +40,7 @@
           = text_field_tag :company_name, params[:company_name] || current_user.organization, class: 'form-control gl-form-input', required: true, data: { qa_selector: 'company_name' }, readonly: readonly
       .form-group.gl-select2-html5-required-fix
         = label_tag :company_size, _('Number of employees'), for: :company_size, class: 'col-form-label'
-        = select_tag :company_size, company_size_options_for_select(params[:company_size]), include_blank: true, class: 'select2', required: true, data: { qa_selector: 'number_of_employees' }
+        = select_tag :company_size, company_size_options_for_select(params[:company_size]), class: 'select2', required: true, data: { qa_selector: 'number_of_employees' }
       .form-group
         = label_tag :phone_number, _('Telephone number'), for: :phone_number, class: 'col-form-label'
         = telephone_field_tag :phone_number, params[:phone_number], pattern:  '^(\+)*[0-9-\s]+$', class: 'form-control gl-form-input', required: true, data: { qa_selector: 'telephone_number' }

ee/spec/views/trials/new.html.haml_spec.rb

@@ -16,10 +16,12 @@ RSpec.describe 'trials/new.html.haml' do
 
   subject { rendered }
 
-  it 'has fields for first, last and company names', :aggregate_failures do
+  it 'has fields for first, last company name and size', :aggregate_failures do
     is_expected.to have_field('first_name')
     is_expected.to have_field('last_name')
     is_expected.to have_field('company_name')
+    sizes = ['Please select', '1 - 99', '100 - 499', '500 - 1,999', '2,000 - 9,999', '10,000 +']
+    is_expected.to have_select('company_size', options: sizes, selected: [])
   end
 
   context 'remove_known_trial_form_fields noneditable experiment is enabled' do