Refactor filter search multiselect to base_token
What does this MR do and why?
Make grouped multiselect more reusable, so we can add to Label token.
Instead of base_token emitting an event and having the parent component do stuff, just do stuff in base token.
This also gets rid of the multiSelectedValues prop, and it is added to some scoped slots so the parent component can access selected items.
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Edited by Simon Knox