In dbt 1.4 the flags warn_error and warn_error_options are defined in profiles.yml:

config:
  warn_error: true
  warn_error_options: 
    include: all
    exclude:
      - NoNodesForSelectionCriteria

Reference: https://github.com/dbt-labs/docs.getdbt.com/blob/1a9ca4d4594fbcf683d260afc83927262b5582a1/website/docs/reference/global-configs.md#warnings-as-errors

Note that the version 1.4 is no longer supported. See https://docs.getdbt.com/docs/dbt-versions/core