The two required_ops*.config files are used in reduced/minimal build CIs.

required_ops.config:
  To generate/update:
    python ../../../tools/python/create_reduced_build_config.py . required_ops.config
  Contains:
    List of all the required operators for .onnx models in the testdata directory.
      Note that add_opset_314159.onnx adds a spurious opset for 'Add' so the config file will contain an entry for that.

required_ops_and_types.config
  To generate/update:
    python ../../../tools/python/create_reduced_build_config.py --format ORT --enable_type_reduction . required_ops_and_types.config
  Contains:
    List of all the required operators and types for .ort models in the testdata directory.
