Set ESP32 CONFIG_FREERTOS_UNICORE=y by default

[mikee47]

As discussed in #2653 there is an issue on dual-core CPUs which causes hang and WDT on IDF 5.0 (and 5.2).
Setting CONFIG_FREERTOS_UNICORE=y fixes the problem. This setting is described as follows:

This version of FreeRTOS normally takes control of all cores of the CPU. Select this if you only want to start it on the first core. This is needed when e.g. another process needs complete control over the second core.

I'd suggest this is a better default behaviour anyway.

[what-the-diff]

PR Summary

• Simplifying Start-Up Process
  A new comment has been added to make sure that we don't initialize the Watchdog Timer (WTD) at startup. This reduces the complexity at system initiation.

• Improving Compatibility with Dual-Core CPUs
  A new configuration has been put in place to address complications encountered while dealing with dual-core CPUs. This improvement will ensure smooth operation and improved performance when our software is run on a system with multiple processing units.