Add pxe_tag to allow tagging_edit from the pxe controller
Add pxe_tag to allow tagging_edit from the pxe controller

pxe/tagging_edit is the entrypoint route for all tagging on pxe servers, etc.:

rake routes |grep -E "pxe.+tag"
                                                              GET              /pxe/tagging_edit(/:id)(.:format)                                                                pxe#tagging_edit
                                                              POST             /pxe/tagging_edit(/:id)(.:format)                                                                pxe#tagging_edit

tagging_edit defaults to looking for a product feature built from the controller
for common methods followed by "_tag" or in this case, 'pxe_tag':
https://github.com/ManageIQ/manageiq-ui-classic/blob/7f0739dd6bfb98027af227f59210b9d2c30acd2c/app/controllers/application_controller/tags.rb#L6

Followup to #21222
This will fix the last failure on https://github.com/ManageIQ/manageiq-ui-classic/pull/7740

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