SDK Generator return values

[PetrKraus]

Non-production mode (debug mode - without the production flag):

• Returns 0 if everything is ok
• Returns 1 if there are major cases failed, anyway the process will passed.
• Returns 2 if there are critical cases failed, process aborts

Production mode (with the Production flag):

• Returns 0 if everything is ok
• Returns 2 if there are major/critical cases failed, process aborts

Related Jira ticket: SDKGEN-863