[api] Pass names to jobhistory_list

Pass project name as is the only thing needed and by coherence with the
other paramethers.

Rename attributes in jobhistory_list to make clear they are just strings
with the name and not objects.

src/api/app/controllers/webui/packages/job_history_controller.rb

@@ -7,7 +7,7 @@ class JobHistoryController < WebuiController
       before_action :set_architecture
 
       def index
-        @jobshistory = @package.jobhistory_list(@project, @repository.name, @architecture.name, @package_name)
+        @jobshistory = @package.jobhistory_list(@project.name, @repository.name, @architecture.name, @package_name)
       end
 
       private

src/api/app/models/package.rb

@@ -914,9 +914,9 @@ def buildresult(prj = project, show_all = false)
     LocalBuildResult::ForPackage.new(package: self, project: prj, show_all: show_all)
   end
 
-  def jobhistory_list(project, repository, arch, package_name)
+  def jobhistory_list(project_name, repository_name, arch_name, package_name)
     begin
-      results = Xmlhash.parse(Backend::Api::BuildResults::JobHistory.all_for_package(project.name, package_name, repository, arch))
+      results = Xmlhash.parse(Backend::Api::BuildResults::JobHistory.all_for_package(project_name, package_name, repository_name, arch_name))
     rescue Backend::Error
       return []
     end