feat: remove redundant user instance variable

app/jobs/scheme_email_csv_job.rb

@@ -8,7 +8,7 @@ class SchemeEmailCsvJob < ApplicationJob
   def perform(user, search_term = nil, filters = {}, all_orgs = false, organisation = nil, download_type = "combined") # rubocop:disable Style/OptionalBooleanParameter - sidekiq can't serialise named params
     unfiltered_schemes = organisation.present? && user.support? ? Scheme.where(owning_organisation_id: organisation.id) : user.schemes
     filtered_schemes = FilterManager.filter_schemes(unfiltered_schemes, search_term, filters, all_orgs, user)
-    csv_string = Csv::SchemeCsvService.new(user:, download_type:).prepare_csv(filtered_schemes)
+    csv_string = Csv::SchemeCsvService.new(download_type:).prepare_csv(filtered_schemes)
 
     case download_type
     when "schemes"

app/services/csv/scheme_csv_service.rb

@@ -3,8 +3,7 @@ module Csv
     include SchemesHelper
     include LocationsHelper
 
-    def initialize(user:, download_type:)
-      @user = user
+    def initialize(download_type:)
       @download_type = download_type
     end