Remove deprecated code

[elrayle]

Description

Remove deprecated code in preparation of next major release.

TODO

• [x] update all fixture configs to use ldpath instead of predicates
  • PR #284 update lod_lang* fixtures to use ldpath only (as part of updates to ldpath service)
  • PR #290 update lod_full_config fixture to only use ldpath
  • PR #293 update remaining lod config fixtures to only use ldpath
• [ ] update query and find to no longer reference predicates (i.e. /lib/qa/authorities/linked_data/search_query and find_term)
• [ ] remove config processing of predicates (i.e. /lib/qa/authorities/linked_data/config/search_config and term_config)
• [ ] remove services supporting predicates (search /app/services deprecat to find services to be updated)
• [ ] remove any other deprecations (search entire qa for deprecat)

Related Work

PR #284 updates fixture configs related to language processing to use ldpath