CLI: add 126 exit code for high error ratio

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 98.98%. Comparing base (dafbe6d) to head (817b9e5). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #747 +/- ## ======================================= Coverage 98.98% 98.98% ======================================= Files 21 21 Lines 3546 3552 +6 ======================================= + Hits 3510 3516 +6 Misses 36 36 ```

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