ODSC-88491: Fix conda environment resolution for slug versus full OCI path inputs

[cheryloracle]

Summary

Fixed ADS conda environment resolution so slug inputs and full OCI conda paths follow separate resolution paths. Short service conda slugs resolve through the service conda index and now fail with explicit slug-specific guidance to use the full Environment Explorer path when unresolved. Full oci:// conda paths are treated as authoritative: they validate object accessibility directly, avoid service_pack/index.json lookup, preserve the original runtime path metadata, and classify custom published paths as published unless the path itself is an explicit service conda bucket/path. Regression tests now assert slug guidance, full-path published metadata, no service-index lookup for full paths, and path-specific validation failures for both training and inference env info.

Tests Run

/tmp/ads-py314-core-venv/bin/python -m pytest tests/unitary/with_extras/model/test_env_info.py::TestTrainingEnvInfo::test_from_slug_not_exist tests/unitary/with_extras/model/test_env_info.py::TestTrainingEnvInfo::test_from_slug_service_pack_list_not_extracted tests/unitary/with_extras/model/test_env_info.py::TestInferenceEnvInfo::test_from_slug_not_exist tests/unitary/with_extras/model/test_env_info.py::TestInferenceEnvInfo::test_from_slug_service_pack_list_not_extracted -q (passed: 4 tests)
/tmp/ads-py314-core-venv/bin/python -m pytest tests/unitary/with_extras/model/test_env_info.py::TestTrainingEnvInfo::test_from_path_cp tests/unitary/with_extras/model/test_env_info.py::TestTrainingEnvInfo::test_from_path_not_accessible tests/unitary/with_extras/model/test_env_info.py::TestInferenceEnvInfo::test_from_path_custom_pack tests/unitary/with_extras/model/test_env_info.py::TestInferenceEnvInfo::test_from_path_not_accessible -q (passed: 4 tests)
/tmp/ads-py314-core-venv/bin/python -m pytest tests/unitary/with_extras/model/test_env_info.py::TestTrainingEnvInfo::test_from_slug_dev_sp tests/unitary/with_extras/model/test_env_info.py::TestTrainingEnvInfo::test_from_slug_prod_sp tests/unitary/with_extras/model/test_env_info.py::TestTrainingEnvInfo::test_from_slug_not_exist tests/unitary/with_extras/model/test_env_info.py::TestTrainingEnvInfo::test_from_slug_service_pack_list_not_extracted tests/unitary/with_extras/model/test_env_info.py::TestTrainingEnvInfo::test_from_path_cp tests/unitary/with_extras/model/test_env_info.py::TestTrainingEnvInfo::test_from_path_not_accessible tests/unitary/with_extras/model/test_env_info.py::TestInferenceEnvInfo::test_from_slug_dev_sp tests/unitary/with_extras/model/test_env_info.py::TestInferenceEnvInfo::test_from_slug_prod_sp tests/unitary/with_extras/model/test_env_info.py::TestInferenceEnvInfo::test_from_slug_not_exist tests/unitary/with_extras/model/test_env_info.py::TestInferenceEnvInfo::test_from_slug_service_pack_list_not_extracted tests/unitary/with_extras/model/test_env_info.py::TestInferenceEnvInfo::test_from_path_custom_pack tests/unitary/with_extras/model/test_env_info.py::TestInferenceEnvInfo::test_from_path_not_accessible -q (passed: 12 tests)
/tmp/ads-py314-core-venv/bin/python -m pytest tests/unitary/with_extras/model/test_env_info.py -q (failed: test_get_service_packs_bad_response due local OCI auth config/default signer; 24 passed)
/tmp/ads-py314-core-venv/bin/python -m pytest tests/unitary/with_extras/model/test_artifact.py -q (blocked: ModuleNotFoundError: No module named 'skl2onnx')

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