Fix: create_external_models misclassifies cross-repo models as external #3582

Job	Run time
changes	6s
test-vscode	22s
test-dbt-versions (1.6)	1m 41s
test-dbt-versions (1.7)	1m 48s
test-dbt-versions (1.4)	1m 42s
test-dbt-versions (1.3)	1m 54s
test-dbt-versions (1.5)	1m 48s
test-dbt-versions (1.8)	1m 48s
test-dbt-versions (1.10)	1m 53s
test-dbt-versions (1.9)	1m 49s
test-vscode-e2e	-1s
migration-test	1m 35s
cicd-tests-windows	12m 1s
doc-tests	32s
style-and-cicd-tests (3.11)	3m 5s
style-and-cicd-tests (3.10)	3m 8s
style-and-cicd-tests (3.13)	3m 19s
style-and-cicd-tests (3.9)	3m 33s
style-and-cicd-tests (3.12)	3m 20s
engine-tests-docker (postgres)	2m 23s
engine-tests-docker (trino)	8m 17s
engine-tests-docker (mysql)	1m 52s
engine-tests-docker (mssql)	1m 56s
engine-tests-docker (spark)	5m 17s
engine-tests-docker (duckdb)	1m 23s
engine-tests-docker (clickhouse)	2m 57s
engine-tests-docker (risingwave)	2m 26s
ui-style	0s
ui-test	0s
engine-tests-cloud	-1s
	1h 11m 53s

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