Sample command to solve compile or upload issue is now shown to CLI users

[silvanocerza]

Please check if the PR fulfills these requirements

• The PR has no duplicates (please search among the Pull Requests
  before creating one)
• The PR follows
  our contributing guidelines
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)
• UPGRADING.md has been updated with a migration guide (for breaking changes)

• What kind of change does this PR introduce?

Enhances certain error messages of compile and upload commands.

• What is the current behavior?

$ arduino-cli core list


$ arduino-cli compile -b arduino:samd:nano_33_iot ~/Arduino/Blink

Error during build: Platform 'arduino:samd' not found: platform not installed

$ arduino-cli compile -b adafruit:samd:adafruit_feather_m4 ~/Arduino/Blink

Error during build: Platform 'adafruit:samd' not found: platform not installed

$ arduino-cli upload -b arduino:samd:nano_33_iot ~/Arduino/Blink -p /dev/ttyACM1
Error during Upload: Unknown FQBN: platform arduino:samd is not installed

$ arduino-cli upload -b adafruit:samd:adafruit_feather_m4 ~/Arduino/Blink -p /dev/ttyACM1
Error during Upload: Unknown FQBN: unknown package adafruit

• What is the new behavior?

$ arduino-cli core list


$ arduino-cli compile -b arduino:samd:nano_33_iot ~/Arduino/Blink

Error during build: Platform 'arduino:samd' not found: platform not installed
Try running `arduino-cli core install arduino:samd`

$ arduino-cli compile -b adafruit:samd:adafruit_feather_m4 ~/Arduino/Blink

Error during build: Platform 'adafruit:samd' not found: platform not installed
Platform adafruit:samd is not found in any known index

$ arduino-cli upload -b arduino:samd:nano_33_iot ~/Arduino/Blink -p /dev/ttyACM1
Error during Upload: Platform 'arduino:samd' not found: platform arduino:samd is not installed
Try running `arduino-cli core install arduino:samd`

$ arduino-cli upload -b adafruit:samd:adafruit_feather_m4 ~/Arduino/Blink -p /dev/ttyACM1
Error during Upload: Platform 'adafruit:samd' not found: unknown package adafruit
Platform adafruit:samd is not found in any known index

• Does this PR introduce a breaking change, and is
  titled accordingly?

Nope.

• Other information:

Closes #1356.

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[umbynos]

All the added logic happens if output.OutputFormat != "json", this means that no error is returned in case the output is json

[per1234]

A very helpful enhancement.
Thanks Silvano!

[silvanocerza]

Link check workflows are failing again, it's a false positive as usual. Merging anyway.

Thanks @per1234. <3