fix: defer board+port state update for extensions

[kittaakos]

Motivation

To fix a race condition when setting the Arduin state for extensions at app startup. If the board+port state is set before it's read from the localStorage, clients will get an undefined fqbn.

Change description

Defer updating the board+port state for extensions when it's ready.

Other information

Ref: #2165
Ref: dankeboy36/esp-exception-decoder#10

Steps to reproduce:

• you have an ESP32 board, the ESP32 platform and the debugger extension are installed.
• create a new sketch,
• attach the board, select the board and port, and save the sketch,
• upload the sketch,
• open the decoder terminal with the ESP Exception Decoder: Show Decoder Terminal command,
• you see the FQBN and the sketch printed to the console,
• quit IDE2,
• start IDE2 and open the decoder terminal. You see the FQBN instead of the No board selected error message.

Reviewer checklist

• PR addresses a single concern.
• The PR has no duplicates (please search among the Pull Requests before creating one)
• PR title and description are properly filled.
• Docs have been added / updated (for bug fixes / features)

[per1234]

I verified this fixes dankeboy36/esp-exception-decoder#10. Thanks Akos!