wwan: T7487: identify modem by port ownership, not interface number

modem_index() in python/vyos/utils/wwan.py derived the ModemManager modem index straight from the interface name (wwan0 -> 0). The kernel-assigned WWAN interface number and ModemManager's own modem index are two independently enumerated values and are not guaranteed to match - on a box with more than one modem, they can enumerate in different orders, so modem index 0 does not necessarily own wwan0. Every function in this module funnels through modem_index() (start_modem_manager, modem_disconnect, modem_connect, and both admin-disconnect marker helpers), and is_wwan_connected() in vyos.utils.network had its own separate copy of the same assumption - so a single reversed enumeration order silently commands the wrong physical modem for every one of them.

modem_index() now lists every modem ModemManager currently knows about and returns whichever one actually has ifname in its own port list, instead of assuming the correspondence. A modem that has not shown up on the bus yet looks the same as one that will never exist, so this waits up to the same modem_wait_timeout budget start_modem_manager() already gives a modem to become dialable, then returns None if nothing claimed the interface. is_wwan_connected() now calls the same resolver instead of keeping its own copy of the old assumption.

None is a real, expected return now, not just a theoretical one - the three callers that previously assumed modem_index() always produced *a* string (right or wrong) are updated: start_modem_manager() bails out early (matching the tolerance its own caller's w.exists() check already has for hardware that isn't detected yet), modem_disconnect() and modem_connect() treat it as nothing to disconnect / a failed dial, matching each function's own existing return contract. show_wwan.py's modem_info() raises a clear, specific error instead, which its own top-level exception handler already reports cleanly. set_admin_disconnected()/clear_admin_disconnected() only ever used modem_index() to validate the interface name looks like a WWAN interface in the first place, so they're unaffected.

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