OptionsWidgetBase options are stale

I compared the patch to Drupal 11.x today and there are no similar changes. Therefore, I think this is still valid.

Patch for 11.x.

I noticed a big performance hit since getOptions is called on both the selection options and getting the selected options in getSelectedOptions. This doubled the number of queries.

I suggest just clearing the options cache before building the element, this will solve the caching problem when rebuilding (the solution is in the open merge request)