INF-572 : query formatting / linting and minor refactoring

[JulianTonti]

• export_unique_list - formatting only
• export_relations - formatting only
• export_output_types - formatting only
• export_metrics - formatting only
• export_events - formatting only
• export_dois - formatting and one suggestion
• export_disciplines - formatting only
• export_access_types - formatting only
• create_wos - formatting only
• create_unpaywall -
  • refactored repositories sub-query
  • replaced binary CASEs with IFs
  • replaced other_platform_categories CASE with COUNTIF
• create_unpaywall_repo_names - switched to IFNULL
• create_scopus - formatting only
• create_ror - formatting only
• create_orcid - formatting only
• create_openalex - formatting only
• create_open_citations - fully refactored query
• create_mag - formatting, switched one IF for IFNULL
• create_doi -
  • switched IFs for IFNULLs
  • one query on count field
  • added consistent use of CASTs
  • formatting
• create_crossref_fundref - formatting only
• create_crossref_events - formatting only
• create_book - refactored JavaScript UDF and added tests
• create_aggregate - formatting only
• comparison_view - formatting only