fix: iPXE boot interface neutron logic detection

[mfencik]

This patch fixes below described logic which caused undersync to not sync properly due to leftover neutron ports created by ironic.

The neutron network interface's add_ports_to_network() function only checked for 'pxe_boot' capability when determining PXE capability, but iPXE is also a form of PXE booting and should be treated the same way. This caused inconsistent behavior for boot interfaces like 'http-ipxe' that have 'ipxe_boot' capability but not 'pxe_boot' capability.

Without this fix, iPXE boot interfaces were incorrectly treated as non-PXE capable, causing the neutron interface to create ports for all baremetal ports with local_link_connection info during cleaning operations, regardless of their pxe_enabled setting.

This change updates the pxe_capability detection logic to include 'ipxe_boot' capability alongside 'pxe_boot', ensuring that iPXE boot interfaces are correctly recognized as PXE-capable.

As a secondary benefit, this also fixes an inconsistency where the port deletion logic in remove_ports_from_network() was not using the same pxe_capability logic as port creation, which did lead to orphaned neutron ports after cleaning operations.

This has been tested in dev environment and it works.

[cardoe]

We can merge this and you can submit this upstream like this but I'll say I think the best approach would be to add:

def is_capable(self, cap) -> bool:
    pass

on the BootInterface. The reality its that in the code base ipxe_boot implies pxe_boot.