Remove correct_work_item_type_id from work item index

Description

This is an Elasticsearch migration to remove correct_work_item_type_id from the work item index.

I copied the migration spec from !132856 (merged) and !162753 (merged), but my plan is to extract a shared example in ee/spec/support/shared_examples/elastic/migration_shared_examples.rb, so we will have that available for future migrations.

Related to #501696 (closed).