Fixed missing `ARDUINO_USER_AGENT` env var setting. (#2501)

* Added integration test

* Fixed missing ARDUINO_USER_AGENT env var

Added backward compatibilty policy document (#2470)

* Added versioning/upgrading policy

* Added backward compatibility policy

Fix caching for libraries when installation folder differents from Na…

…me (#2446)

* Fix caching for libraries when installation folder differents from Name

* Prepare infra to add integration test

* Added integration test

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Co-authored-by: Cristian Maglie <c.maglie@arduino.cc>

Added `debug check` command to check if a combination of board/progra…

…mmer supports debugging. (#2443)

* Moved rcp message to proper position

* Added gRPC command to check for debugger support

* Made debug flags var non-global

* Implementation of 'debug check' command

* Implementation of cli command 'debug check'

* added integration test

* Renamed field for clarity

* Added minimum debug_fqbn computation in 'debug check' command

fix: debugging requires a non empty debug.executable (#2439)

* fix: debugging requires a non empty debug.executable

* Updated docs

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Co-authored-by: Cristian Maglie <c.maglie@arduino.cc>