Maintenance: Blacklight 9 SearchService no longer accepts user_params argument

[corylown]

Description

search_state object must be used instead of user_params

See:

spotlight/app/controllers/concerns/spotlight/search_helper.rb

Lines 6 to 9 in 6d10822

	def search_service(user_params = respond_to?(:search_state, true) ? search_state.to_h : {})
	klass = respond_to?(:search_service_class) ? search_service_class : Blacklight::SearchService
	klass.new(config: blacklight_config, user_params:, **search_service_context)

[corylown]

One complication is that Spotlight appears to be dependent on the fact that if you pass a hash rather than a SearchState instance as an argument to Blacklight::SearchService it instantiates @search_state from Blacklight::SearchState instead of Spotlight::SearchState. It would be nice to remove Spotlight's definition of search_service and use what's coming from Blacklight::Searchable but that does not appear to be possible without unpacking where we're depending on Spotlight's SearchState vs Blacklight's.