Serial port selection provides too many options, some of which are invalid

[jessebraham]

Previously we filtered the available serial ports to only those which looked like ESP devices. This was changed to display all devices, however, due to reports from some users that not all ports were listed on some Linux distributions. However, as a result of this change there are too many ports listed on other OSs (like macOS), many of which are not flashable in any way.

I would like to see us go back to filtering serial ports, and maybe we can have an option to list everything using a flag and/or environment variable instead.