Zigbee avoid disabling console serial on ESP32 and improved log messages

[s-hadinger]

Description:

Zigbee would mistakenly disable serial logging on ESP32.
Improved handling of Serial errors.
Improved logging for ESP32 for Zigbee serial.

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.7
• The code change is tested and works with Tasmota core ESP32 V.3.0.4
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass