Remove Drush 8 integration

Hi Thanks for opening an issue when you see something that seems like a problem.

The code you seem not to agree with is drush_log($text);.
This function comes from Drush 8. Drush 8 is no longer recommended and is not compatible with Drupal 10.
Config Split 1.x now requires Drupal 9, which in turn is not supported by Drush 8. So instead of trying to "fix" this. We should instead totally remove it! The code path which offends you is never loaded in Drupal 10 since it is Drush 8 code. I was about to close this issue as won't fix. But instead I am retitling it.

See https://www.drush.org/11.x/install/#drupal-compatibility

bircher → closed merge request !33

Prashant.c → made their first commit to this issue’s fork.

Prashant.c → changed the visibility of the branch 3362191-remove-drush-8-compatibility to hidden.

Prashant.c → changed the visibility of the branch 3362191-drupal-10-compatibility to active.

As per the comments in https://www.drupal.org/project/config_split/issues/3362191#comment-15074998 📌 Remove Drush 8 integration Needs review , removing the config_split.drush.inc file. Changing status to NR.

Thanks