Fix monitor service id creation

[AlbyIanna]

Motivation

This PR solves an issue that happens when uploading a sketch to some boards when the serial port is open.

Some boards need configuration parameters to append to the fqbn during the upload:
https://github.com/arduino/arduino-ide/blob/main/arduino-ide-extension/src/browser/contributions/upload-sketch.ts#L216-L219

and this is messing up with the MonitorManager because when notifyUploadStarted() is called, the monitor ID won't match the MonitorService instance that handles the serial connection:
https://github.com/arduino/arduino-ide/blob/main/arduino-ide-extension/src/node/monitor-manager.ts#L114-L119

Change description

Add some logic to make sure only the first part of an fqbn is relevant when creating a monitorID
https://github.com/arduino/arduino-ide/compare/fix-monitor-id?expand=1#diff-cf90510ad3f811b7073a1934f11698463693bf446a2521eb2a55f27a48328427R218-R220

Other information

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]

This fixes the issue for me. Great work @AlbyIanna!