Fix: harden ValidationInfo.data access for Pydantic 2.13 compat #3552

Job	Run time
changes	7s
test-vscode	1m 0s
test-dbt-versions (1.5)	1m 28s
test-dbt-versions (1.8)	1m 45s
test-dbt-versions (1.6)	1m 33s
test-dbt-versions (1.4)	1m 35s
test-dbt-versions (1.9)	1m 39s
test-dbt-versions (1.10)	1m 37s
test-dbt-versions (1.3)	1m 38s
test-dbt-versions (1.7)	1m 40s
test-vscode-e2e	0s
cicd-tests-windows	10m 49s
doc-tests	34s
migration-test	1m 33s
style-and-cicd-tests (3.10)	21m 45s
style-and-cicd-tests (3.12)	23m 25s
style-and-cicd-tests (3.13)	24m 22s
style-and-cicd-tests (3.9)	24m 0s
engine-tests-docker (mysql)	1m 46s
engine-tests-docker (postgres)	2m 37s
engine-tests-docker (clickhouse)	2m 38s
engine-tests-docker (risingwave)	2m 42s
engine-tests-docker (duckdb)	1m 27s
engine-tests-docker (spark)	6m 9s
engine-tests-docker (trino)	7m 56s
engine-tests-docker (mssql)	1m 46s
style-and-cicd-tests (3.11)	1h 46m 27s
ui-style	0s
ui-test	0s
engine-tests-cloud	0s
	4h 13m 58s

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