Add First & last name on the trial form

Gitlab currently only has one full name field. People with one name
there can't signup for trials.

ee/app/controllers/trials_controller.rb

@@ -46,12 +46,12 @@ class TrialsController < ApplicationController
   end
 
   def company_params
-    params.permit(:company_name, :company_size, :phone_number, :number_of_users, :country)
+    params.permit(:company_name, :company_size, :first_name, :last_name, :phone_number, :number_of_users, :country)
           .merge(extra_params)
   end
 
   def extra_params
-    attrs = current_user.slice(:first_name, :last_name)
+    attrs = {}
     attrs[:work_email] = current_user.email
     attrs[:uid] = current_user.id
     attrs[:skip_email_confirmation] = true

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

@@ -9,6 +9,12 @@
 = render 'errors'
 
 = form_tag create_lead_trials_path, method: :post do |f|
+  .form-group
+    = label_tag :first_name, _('First name'), for: :first_name, class: 'col-form-label'
+    = text_field_tag :first_name, params[:first_name] || current_user.first_name, class: 'form-control', required: true
+  .form-group
+    = label_tag :last_name, _('Last name'), for: :last_name, class: 'col-form-label'
+    = text_field_tag :last_name, params[:last_name] || current_user.last_name, class: 'form-control', required: true
   .form-group
     = label_tag :company_name, _('Company name'), for: :company_name, class: 'col-form-label'
     = text_field_tag :company_name, params[:company_name], class: 'form-control', required: true

ee/changelogs/unreleased/33742-last-name-validation-error-for-existing-users-with-single-word-f.yml

+---
+title: Add First & last name on the trial form
+merge_request: 33742
+author:
+type: changed

ee/spec/controllers/trials_controller_spec.rb

@@ -73,13 +73,13 @@ describe TrialsController do
           params = {
               company_name: 'Gitlab',
               company_size: '1-99',
+              first_name: user.first_name,
+              last_name: user.last_name,
               phone_number: '1111111111',
               number_of_users: "20",
               country: 'IN'
           }
           extra_params = {
-              first_name: user.first_name,
-              last_name: user.last_name,
               work_email: user.email,
               uid: user.id,
               skip_email_confirmation: true,