Extract EE specific files/lines for some projects features specs

We have the following files containing EE specific code. We should move them to ee/

• spec/features/projects/actve_tabs_spec.rb
• spec/features/projects/blobs/blob_show_spec.rb
• spec/features/projects/jobs_spec.rb
• spec/features/projects/members/member_leaves_project_spec.rb
• spec/features/projects/milestones/milestone_spec.rb
• spec/features/projects/show/developer_views_empty_project_instructions_spec.rb
• spec/features/projects/user_sees_sidebar_spec.rb