- If the initial filesystem mounting fails, then a subsequent file.format()
  does not mount it afterwards, necessitating a node.restart(). In the normal
  case, after file.format() the filesystem is mounted and ready for use.
  We now explicitly remount after a format to gain consistent behaviour.

- If using USB CDC, the auto-format on first boot interferes with USB
  enumeration, resulting in a failed startup. We now avoid doing an
  auto-format if the USB CDC console is enabled. The behaviour is
  configurable/overrideable via Kconfig.

This allegedly resolves the reboot crashes seen on ESP32-S3 Zero.
It also removes the peculiar need to explicitly call
esp_vfs_console_register(), the absence of which previously would
trigger an assertion failure in xQueueGenericSend on input.