tests(v2): Add Cloud array-metadata parity tests (round-trip + contains/not_contains)

[oss-amikos]

Context\nArray metadata and containment filters are part of parity coverage in chroma-go cloud tests.\n\n## Scope\n- Add records with array metadata (string/number/bool arrays).\n- Validate round-trip retrieval.\n- Validate contains/not_contains filter behavior in cloud integration tests.\n\n## Acceptance Criteria\n- Array metadata behavior is verified in live cloud parity tests.\n- Filter semantics are validated for supported array types.\n\nRelated: #94