wwan automated tests should output something

[Pierre Equoy]

Currently, WWAN automated tests such as `wwan/check-sim-present-{manufacturer}-{model}-{hw_id}-auto` and `wwan/detect` don't have any output when they pass.

It would be beneficial to have some output for the report.

For instance:

wwan/detect: some information about the detected WWAN module(s)
wwan/check-sim-present-*-auto: information from mmcli about the SIM card (path to SIM, phone number... anything relevant from `mmcli -m <module number>`)