GHSA-RRXG-G2PF-6HH4 ESPHome Device Builder: Renamed auth env vars silently disable dashboard authentication on upgrade

Summary The dashboard reads its authentication credentials from $ESPHOMEUSERNAME and $ESPHOMEPASSWORD. Earlier versions, and the legacy esphome dashboard, read the bare $USERNAME and $PASSWORD instead. When the env vars were renamed the bare names were dropped with no fallback, so an operator who...