Make the logging of the pairing codes nicer in CommissioningWindowOpener. (#20023)
Make the logging of the pairing codes nicer in CommissioningWindowOpener. (#20023)

1) Only log when the commissioning window has in fact been opened successfully.
2) Log right after the "Successfully opened pairing window on the device" bit,
   which makes it much easier to find in the logs (e.g. for chip-tool this now
   comes right before shutdown, not before the log noise from various other
   things).
nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip