fix(config): stringify pydantic error loc before join #3913

Job	Run time
test-dbt-versions (1.6)	1m 39s
changes	6s
test-dbt-versions (1.4)	1m 27s
test-dbt-versions (1.9)	1m 47s
test-dbt-versions (1.3)	1m 40s
test-dbt-versions (1.8)	1m 37s
test-dbt-versions (1.10)	1m 57s
test-dbt-versions (1.5)	1m 46s
test-dbt-versions (1.7)	1m 47s
test-vscode-e2e	0s
test-vscode	-10s
cicd-tests-windows	9m 49s
doc-tests	34s
migration-test	1m 25s
style-and-cicd-tests (3.13)	23m 4s
style-and-cicd-tests (3.11)	22m 53s
style-and-cicd-tests (3.10)	24m 23s
style-and-cicd-tests (3.9)	24m 34s
engine-tests-docker (trino)	8m 24s
engine-tests-docker (mysql)	1m 41s
engine-tests-docker (mssql)	1m 52s
engine-tests-docker (risingwave)	2m 37s
engine-tests-docker (clickhouse)	2m 42s
engine-tests-docker (spark)	5m 29s
style-and-cicd-tests (3.12)	25m 16s
engine-tests-docker (postgres)	2m 14s
engine-tests-docker (starrocks)	2m 42s
engine-tests-docker (duckdb)	1m 34s
ui-test	0s
ui-style	0s
engine-tests-cloud	-1s
	2h 54m 48s

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