Reject mismatched relationship columns in converters

[LiangRuoShui]

Summary

• Add fail-fast validation in the GoodData and Wisdom Ossie exporters when relationship from_columns and to_columns have different lengths.
• Prevent Python zip() from silently truncating composite join columns and emitting incomplete target joins/references.
• Add regression tests for mismatched relationship column arrays in both converters.

Why

Ossie relationships define column pairs positionally: each from_columns[n] must correspond to to_columns[n]. When the arrays differ in length, the relationship is malformed and cannot be faithfully converted. GoodData and Wisdom previously used zip() directly, which dropped extra columns without an error.

Test Plan

• cd converters/gooddata && uv run pytest -q -> 75 passed
• cd converters/wisdom && uv run pytest -q -> 28 passed
• git diff --check