Remove unused password argument from notification

We were still passing a 'password' argument around, but it is not used
anywhere because we send a password reset link in the welcome email
nowadays.

app/mailers/emails/profile.rb

 module Emails
   module Profile
-    def new_user_email(user_id, password, token = nil)
+    def new_user_email(user_id, token = nil)
       @user = User.find(user_id)
-      @password = password
       @target_url = user_url(@user)
       @token = token
       mail(to: @user.email, subject: subject("Account was created for you"))

app/services/notification_service.rb

@@ -107,7 +107,7 @@ class NotificationService
   # Notify new user with email after creation
   def new_user(user, token = nil)
     # Don't email omniauth created users
-    mailer.new_user_email(user.id, user.password, token) unless user.extern_uid?
+    mailer.new_user_email(user.id, token) unless user.extern_uid?
   end
 
   # Notify users on new note in system

spec/mailers/notify_spec.rb

@@ -46,7 +46,7 @@ describe Notify do
 
     token = 'kETLwRaayvigPq_x3SNM'
 
-    subject { Notify.new_user_email(new_user.id, new_user.password, token) }
+    subject { Notify.new_user_email(new_user.id, token) }
 
     it_behaves_like 'an email sent from GitLab'
 
@@ -83,7 +83,7 @@ describe Notify do
     let(:example_site_path) { root_path }
     let(:new_user) { create(:user, email: 'newguy@example.com', password: "securePassword") }
 
-    subject { Notify.new_user_email(new_user.id, new_user.password) }
+    subject { Notify.new_user_email(new_user.id) }
 
     it_behaves_like 'an email sent from GitLab'