Fix PicoW Infinite Reboot due to WiFi Failure

[brentru]

This pull request aims to fix the PicoW infinite reboot bug due to WiFi failure. This issue seems to mostly be occurring on routers that are mesh networks or far away from a Rasberry Pi Pico W.

The result is in an inoperable WipperSnapper device as the WiFi never connects and the WDT is kicked, forcing the device to reboot forever:

Adafruit.io WipperSnapper
-------Device Information-------
....
Board ID: rpi-pico-w
....
-------------------------------
Generating device's MQTT topics...
Running Network FSM...
Connecting to WiFi...
Attempting to connect to WiFi...
Attempting to connect to WiFi...
Attempting to connect to WiFi...
Attempting to connect to WiFi...
Attempting to connect to WiFi...
ERROR: Unable to connect to WiFi!
ERROR [WDT RESET]: ERROR: Unable to connect to WiFi, rebooting soon...

This pull request:

• Increases WiFi connection reliability
  • In ws_networking_pico.h, this PR now sets a 20-second timeout for connecting to an AP, rather than the default, and waits a full 20 seconds to establish a connection.
  • Discovered that the max WDT for the PicoW is ~8sec and reloaded with the amount of time it was initialized with (6sec, globally). The wdt is now reloaded before longer (blocking/async) function calls within runNetFSM() to avoid accidentally timing out the WDT.

Resolves:
#436
#435
#432

[brentru]

@tyeth ready for review

[earlephilhower]

FYI:

WIP: Updates our build CI to use the latest version of arduino-pico to grab PR earlephilhower/arduino-pico#1883 and we may want to wait for earlephilhower/arduino-pico#1884 as well before merging

Those PRs only affect FreeRTOS sketches, and this project doesn't seem to use FreeRTOS so they shouldn't affect things here. If there are WiFi issues on bare metal, don't hesitate to open up something on the Arduino-Pico repo, of course!

You'll also need to undo the change to the doxygen yml in this PR since it points to your repo, not Adafruit's now.

[brentru]

Those PRs only affect FreeRTOS sketches, and this project doesn't seem to use FreeRTOS so they shouldn't affect things here.

Interestingly, I noticed the WiFi connection stability increase when building from arduino-pico master vs Release. But since things have changed and you've clarified this only affects FreeRTOS sketches, I'll try building this PR off the Release.

[brentru]

No difference between building off arduino-pico release, this PR fixes the timing/timeouts. Thanks for the clarification @earlephilhower.