🐛 cli.py: return non zero code when final evaluation returns false

Describe the bug tirith always return zero code even when the final evaluator returns false (failed)

To Reproduce I was using these files: plan.json.txt apigateway_state_logging_enabled.tirith.json.txt

Steps to reproduce the behavior:

1. Download and rename both of the files above, from .txt to .json
2. Run tirith -policy-path apigateway_state_logging_enabled.tirith.json -input-path plan.json
3. The final evaluation should be failed
4. Check the return code by doing echo $?
5. It will print 0 instead of 1

Expected behavior It should return non-zero code as it will make the caller of the program knows that tirith final evaluation has failed