fix(sequences): accept list ids/external_ids in retrieve_last_row (#2266)

[dipendrapant]

Fixes #2266.

Summary

SequencesDataAPI.retrieve_last_row now accepts:

• id: int | typing.Sequence[int] | None
• external_id: str | SequenceNotStr[str] | None

Behavior:

• Single identifier → returns SequenceRows
• Multiple identifiers → aggregates into SequenceRowsList

Rationale

Docs and docstring say lists are supported, but the implementation only handled single values. This aligns code with docs and mirrors the list semantics used elsewhere.

Implementation notes

• Normalize identifiers via IdentifierSequence.load(...)
• For multiple identifiers, call /sequences/data/latest per identifier and aggregate using execute_tasks(...)
• Keep single-identifier path unchanged
• Updated docstring (types + return description)

Testing done

• Unit tests added: tests/tests_unit/test_api/test_sequences_data.py
  • list of external_id → returns SequenceRowsList, 2 HTTP calls
  • single id → returns SequenceRows, 1 HTTP call
• Local checks:
  • poetry run pytest -q tests/tests_unit -k retrieve_last_row
  • poetry run pre-commit run --all-files (ruff, ruff-format, mypy, custom checks, pydoclint) all pass

Note that the integration tests were not run locally; CI should cover these.

Backwards compatibility

• No breaking changes: single-identifier behavior unchanged
• Expanded accepted types only

Files changed

• cognite/client/_api/sequences.py
• tests/tests_unit/test_api/test_sequences_data.py

Checklist

• Tests added/updated
• Docstring updated (docs are generated from docstrings)

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