Move share examples to their correct location

spec/support/protected_branches/access_control_ce_shared_examples.rb → spec/support/shared_examples/features/protected_branches_access_control_ce.rb

-RSpec.shared_examples "protected branches > access control > CE" do
+shared_examples "protected branches > access control > CE" do
   ProtectedBranch::PushAccessLevel.human_access_levels.each do |(access_type_id, access_type_name)|
     it "allows creating protected branches that #{access_type_name} can push to" do
       visit namespace_project_protected_branches_path(project.namespace, project)