Fix: create_external_models misclassifies cross-repo models as extern… #3604

Job	Run time
changes	7s
test-dbt-versions (1.6)	1m 34s
test-dbt-versions (1.4)	1m 45s
test-dbt-versions (1.10)	1m 46s
test-dbt-versions (1.8)	1m 40s
test-dbt-versions (1.9)	1m 52s
test-dbt-versions (1.5)	1m 38s
test-dbt-versions (1.7)	1m 43s
test-dbt-versions (1.3)	1m 44s
test-vscode	0s
test-vscode-e2e	0s
cicd-tests-windows	11m 11s
style-and-cicd-tests (3.9)	23m 44s
ui-test	1m 19s
doc-tests	39s
style-and-cicd-tests (3.11)	21m 1s
migration-test	1m 47s
engine-tests-docker (mysql)	1m 52s
engine-tests-docker (postgres)	2m 15s
style-and-cicd-tests (3.10)	24m 15s
engine-tests-docker (spark)	6m 32s
engine-tests-docker (risingwave)	2m 43s
engine-tests-docker (clickhouse)	2m 55s
engine-tests-docker (trino)	8m 40s
engine-tests-docker (duckdb)	1m 32s
style-and-cicd-tests (3.13)	21m 27s
style-and-cicd-tests (3.12)	25m 57s
engine-tests-docker (mssql)	2m 5s
ui-style	-1s
engine-tests-cloud (clickhouse-cloud)	13m 18s
engine-tests-cloud (fabric)	5m 1s
engine-tests-cloud (redshift)	5m 17s
engine-tests-cloud (gcp-postgres)	3m 35s
engine-tests-cloud (databricks)	11m 20s
engine-tests-cloud (bigquery)	16m 0s
engine-tests-cloud (athena)	21m 31s
engine-tests-cloud (snowflake)	9m 59s
	4h 19m 43s

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