Distinct exit codes for the various error cases

[bozhodimitrov]

This PR attempts to follow the Linux/Bash convention for exit codes. See more at Exit Codes With Special Meanings (You might need to use the Google web cache, because the resource seems to be down right now).

Basically we will have the following:

• 1 for standard error
• 130 for interrupted process by user
• 3 for any unexpected error

Bash/GNU examples which return exit code 130:

tail -f /dev/null
# press Ctrl + C
echo $?
# 130

sleep 42
# press Ctrl + C
echo $?
# 130

[bozhodimitrov]

Windows CI pipeline takes ages to complete 🎃 (30+ minutes)

PS: Additional documentation might be required.

[bozhodimitrov]

Changed the name of this argument in order to be consistent with the rest of the codebase.
For example: pre-commit: returncode occurrences

[asottile]