…IDE 2.x debugger tutorials

A major reworking of the debugger configuration system was released in Arduino IDE 2.3.0. One of the user facing changes
is the ability to configure the IDE for the debug probe hardware in use via the "Tools > Programmer" menu selection.

As a side effect of that change, it is now mandatory for the user to make the appropriate selection from that menu in
order to use the debugger. If no selection is made, the IDE disables the "Start Debugging" button. For this reason, it
will be important for the debugger tutorials to include this.

Arduino IDE versions prior to 2.3.0 did not use the "Programmer" selection for configuration of the debugger. Although
selecting a programmer before starting the debugger is not mandatory for users of older versions of the IDE, it also
will not cause any harm and that menu was present in those versions of the IDE as well. So the inclusion of a
"Programmer" menu selection step in the tutorials does not break their compatibility with previous versions of Arduino
IDE 2.x.

A major reworking of the Arduino IDE 2.x debugger configuration system was released in Arduino IDE 2.3.0. This included
a breaking change to the data structure of the debug_custom.json file that allows the user to adjust the debugger
configuration.

The tutorial for using the Arduino IDE 2.x debugger with a J-Link debug probe requires the use of the debug_custom.json
feature. The change to the file's data structure rendered that part of the tutorial outdated. It is hereby updated to
use the new data structure.

Including instructions for the different debug_custom.json structure that would be required for users of versions of
Arduino IDE 2.x older than 2.3.0 would have added significant complexity to an already dense tutorial, making it
significantly less approachable to the reader and prone to misinterpretation. For this reason, the decision was made to
specify a requirement of Arduino IDE 2.3.0 as the minimum for the tutorial.

…rial breaking IDE bug

The tutorial for using the Arduino IDE 2.x debugger with a J-Link debug probe requires the use of a debug_custom.json
file to adjust the debugger configuration in order to allow it to be used with the J-Link.

A regression was introduced in Arduino IDE 2.3.0 that causes the configuration defined in certain fields of
debug_custom.json to no longer have an effect, causing the tutorial to no longer be usable.

A fix for the bug is now in progress, but it will likely be some time before this can be shipped in a new Arduino IDE
release. For this reason, it will be worth adjusting the contents of the debug_custom.json file provided in the tutorial
to work around the bug, allowing it to work with the current versions of Arduino IDE.

Once a new release of Arduino IDE is made with the bug fixed, this commit should be reverted and the minimum IDE version
specified in the tutorial bumped. However the workaround is applied in a manner that will not cause any harm even when
present in the debug_custom.json file while a fixed version of Arduino IDE is in use.