refactoring: rename struct fields for more compatibility tarantool `box.execute` response

src/ir/relation.rs

src/ir/relation/tests.rs

tests/artifactory/ir/expression/suggested_distribution.yaml

tests/artifactory/ir/operator/output_aliases.yaml

tests/artifactory/ir/operator/output_aliases_duplicates.yaml

tests/artifactory/ir/operator/output_aliases_oor.yaml

...ifactory/ir/operator/output_aliases_unsupported_type.yaml

tests/artifactory/ir/operator/projection.yaml

tests/artifactory/ir/operator/scan_rel.yaml

tests/artifactory/ir/operator/selection.yaml

tests/artifactory/ir/operator/sub_query.yaml

tests/artifactory/ir/operator/union_all.yaml

tests/artifactory/ir/plan_no_top.yaml

tests/artifactory/ir/plan_oor_top.yaml

tests/artifactory/ir/relation/table_seg_serialized.yaml

...y/ir/relation/table_seg_serialized_duplicate_columns.yaml

.../artifactory/ir/relation/table_seg_serialized_no_key.yaml

...ry/ir/relation/table_seg_serialized_out_of_range_key.yaml