Entity bundle filter doesn't support

@sea2709 thanks for submitting a patch, this does look like a good update and I will include this with a couple updates.

1. Remove the "use" declaration for "FilterPluginBase" as it is no longer used and is called out by Coder / Codesniffer
2. Rather than update the EnittyBundleFilter::operators() method you can just remove it and use the parent InOperator::operators()
3. Same as above with the EntityBundleFIlter::OperatorOptions(), keep the parent version, it makes use of the "$which" parameter which you added by did not implement.
4. Because the operators being changed to all lowercase "in" and "not in", the default value in "::defineOptions()" needs to be updated.
5. Because operators are being changes to lowercase, we need to make sure the change is compatible to existing views filters configurations which were created previously. I recommend adding an override to "EntityBundleFilter::init()" method and ensure that the:
   

   public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
     parent::init($view, $display, $options);
   
     $this->operator = strtolower($this->options["operator"]);
   }
   

   OR

   public function init(ViewExecutable $view, DisplayPluginBase $display, array &$options = NULL) {
     $this->options['operator'] = strtolower($filter->options["operator"]);
     parent::init($view, $display, $options);
   }
   

Rolled and updated patch that addresses the issues I mentioned previously.

I tested with BEF version 6, and tried the variants of the links, select and radio/checkbox types.

Automatically closed - issue fixed for 2 weeks with no activity.