Try to remove the override functionality from views handlers

OK I found out where the overrides are actually set, it's in Sql::getAggregationInfo() - the 'handler' array defines the overrides when the aggregation function is used.

https://git.drupalcode.org/project/drupal/-/jobs/2006860 confirms that we (just) have some test coverage for this.

Good idea checking. I think that matches then my suggested update to the comment description 📌 Make the comments in Views handler Manager around overrides clearer Needs review roughly?

Yep, left one nit on the MR but that looks good.