Delete obsolete partials

ee/app/views/groups/ee/_old_project_creation_level.html.haml

-- return unless group.feature_available?(:project_creation_level)
-- form = local_assigns.fetch(:form)
-- group = local_assigns.fetch(:group)
-.form-group.row
-  = form.label s_('ProjectCreationLevel|Allowed to create projects'), class: 'col-form-label col-sm-2'
-  .col-sm-10
-    = form.select :project_creation_level, options_for_select(::Gitlab::Access.project_creation_options, group.project_creation_level), {}, class: 'form-control'

ee/app/views/groups/ee/_project_creation_level.html.haml

-- return unless group.feature_available?(:project_creation_level)
-- form = local_assigns.fetch(:form)
-- group = local_assigns.fetch(:group)
-
-.form-group.col-md-9.row.prepend-top-8
-  = form.label :description, s_('ProjectCreationLevel|Allowed to create projects'), class: 'label-bold'
-  = form.select :project_creation_level, options_for_select(::Gitlab::Access.project_creation_options, group.project_creation_level), {}, class: 'form-control'