Check correct permissions before showing Release Evidence link

Changelog: fixed

app/graphql/types/evidence_type.rb

@@ -5,7 +5,7 @@ module Types
     graphql_name 'ReleaseEvidence'
     description 'Evidence for a release'
 
-    authorize :download_code
+    authorize :read_release_evidence
 
     present_using Releases::EvidencePresenter
 

spec/graphql/types/evidence_type_spec.rb

@@ -3,7 +3,7 @@
 require 'spec_helper'
 
 RSpec.describe GitlabSchema.types['ReleaseEvidence'] do
-  it { expect(described_class).to require_graphql_authorizations(:download_code) }
+  specify { expect(described_class).to require_graphql_authorizations(:read_release_evidence) }
 
   it 'has the expected fields' do
     expected_fields = %w[