Display error if `--ignore-warnings` and `--ignore-errors` are passed in same command

[ernilambar]

wp plugin check hello-world --ignore-warnings --ignore-errors

In the CLI command plugin check, passing arguments --ignore-warnings and --ignore-errors at same time will always give empty results. We could warn if both arguments are passed.

[ernilambar]

Blocked by https://github.com/WordPress/plugin-check/issues/153

[davidperezgar]

Should we finish this issue?