Follow up #51782.
> But it's overkill for the default case where people use the default style guide,
> and it introduces both delay and console output as a cost.
When there are no offenses with the coding style generated by code generation,
outputting RuboCop results to the console was redundant.
Since RuboCop has `--format=quiet` option that suppresses console output
when there are no offenses, this PR adds that option:
https://docs.rubocop.org/rubocop/1.63/formatters.html#quiet-formatter
While this PR doesn't resolve any added execution speed by RuboCop,
the frequency of using the generator is not high within the development flow.
Therefore, depending on the execution speed, it might be possible to uncomment #51782,
but this PR respects the defaults in #51782 and doesn't address that.
6afc3682ae