Enhancement: Identify Virtual Printer connection

[b-morgan]

Describe the problem
I have the Virtual Printer enabled and occasionally, OctoPrint will connect to it instead of my real printer (LulzBot TAZ 6). If I want to flash the firmware on the real printer and the virtual printer is connected, the Firmware Updater prints a failure message.

The is an enhancement request to detect when the connected printer is the Virtual Printer and print a unique message instead of attempting to update its firmware and failing.

Send: N0 M110 N0*125
Recv: Marlin: Virtual Marlin!
Send: N3 M115*37
Recv: FIRMWARE_NAME:Virtual Marlin 1.0 PROTOCOL_VERSION:1.0

[github-actions]

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