Fix: harden ValidationInfo.data access for Pydantic 2.13 compat #3551

Job	Run time
changes	8s
test-vscode	57s
test-dbt-versions (1.8)	1m 38s
test-dbt-versions (1.9)	1m 36s
test-dbt-versions (1.6)	1m 39s
test-dbt-versions (1.5)	1m 35s
test-dbt-versions (1.3)	1m 36s
test-dbt-versions (1.7)	1m 47s
test-dbt-versions (1.10)	1m 47s
test-dbt-versions (1.4)	1m 34s
test-vscode-e2e	0s
doc-tests	36s
migration-test	1m 31s
cicd-tests-windows	13m 1s
style-and-cicd-tests (3.12)	21m 32s
style-and-cicd-tests (3.9)	23m 29s
style-and-cicd-tests (3.11)	22m 0s
style-and-cicd-tests (3.13)	32m 4s
engine-tests-docker (duckdb)	1m 39s
style-and-cicd-tests (3.10)	23m 20s
engine-tests-docker (postgres)	2m 35s
engine-tests-docker (mssql)	1m 51s
engine-tests-docker (clickhouse)	3m 11s
engine-tests-docker (risingwave)	3m 13s
engine-tests-docker (trino)	8m 11s
engine-tests-docker (spark)	5m 39s
engine-tests-docker (mysql)	1m 39s
ui-test	0s
ui-style	0s
engine-tests-cloud	-1s
	2h 59m 47s

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