Fix testing errors

Fix problem caching Grape::Entity
- This ensures Marshall.dump does not have issues
  with the Grape::Entity object we are caching via Rails.cache
  Reference: ruby-grape/grape-entity#299

Fix missing params for OccurenceCache init

Include force flag in #fetch params

Make sure hash has indifferent access

Author: scardoso

ee/app/serializers/vulnerabilities/occurrence_entity.rb

@@ -42,4 +42,8 @@ class Vulnerabilities::OccurrenceEntity < Grape::Entity
   def current_user
     return request.current_user if request.respond_to?(:current_user)
   end
+
+  def as_json(*args)
+    serializable_hash(*args).as_json.with_indifferent_access
+  end
 end

ee/lib/gitlab/vulnerabilities/occurence.rb

@@ -40,7 +40,7 @@ def vulnerability_findings
       def cached_vulnerabilities_findings
         results = []
         project_ids_to_fetch.each do |project_id|
-          results += Gitlab::Vulnerabilities::OccurenceCache.new(vulnerable, project_id).fetch
+          results += Gitlab::Vulnerabilities::OccurenceCache.new(vulnerable, project_id, user).fetch
         end
 
         results

ee/lib/gitlab/vulnerabilities/occurence_cache.rb

@@ -11,7 +11,7 @@ def initialize(vulnerable, project_id, user)
         @user = user
       end
 
-      def fetch
+      def fetch(force: false)
         Rails.cache.fetch(cache_key, force: force, expires_in: 1.day) do
           findings = ::Security::VulnerabilityFindingsFinder
             .new(vulnerable, params: { project_id: [project_id] })