feat(neutron): split UnderstackDriver into L2 and Undersync mechanism drivers #5248

Job	Run time
build (dnsmasq, prod) / clean	3s
build (ironic-vnc-container, ./containers/ironic-vnc-container/Dockerfile, ./containers/ironic-vn... / clean	6s
build (shell-operator-ironic, prod) / clean	3s
build (ironic-nautobot-client, prod) / clean	3s
build (nautobot, prod) / clean	3s
build (understack-tests, prod) / clean	6s
build (ansible, prod) / clean	4s
build (ironic-nautobot-client, prod) / build	0s
build (ansible, prod) / build	0s
build (ironic-vnc-container, ./containers/ironic-vnc-container/Dockerfile, ./containers/ironic-vn... / build	-1s
build (understack-tests, prod) / build	0s
build (nautobot, prod) / build	0s
build (shell-operator-ironic, prod) / build	-1s
build (dnsmasq, prod) / build	0s
	26s

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