feat: add cron_tz to model_defaults #3677

Job	Run time
changes	6s
test-dbt-versions (1.5)	1m 38s
test-dbt-versions (1.3)	1m 39s
test-dbt-versions (1.8)	1m 29s
test-dbt-versions (1.9)	1m 39s
test-dbt-versions (1.10)	1m 40s
test-dbt-versions (1.7)	1m 49s
test-dbt-versions (1.6)	1m 38s
test-dbt-versions (1.4)	1m 40s
test-vscode-e2e	-1s
test-vscode	-1s
cicd-tests-windows	13m 11s
migration-test	1m 26s
doc-tests	37s
style-and-cicd-tests (3.9)	24m 20s
style-and-cicd-tests (3.10)	22m 52s
style-and-cicd-tests (3.12)	24m 40s
style-and-cicd-tests (3.13)	21m 30s
style-and-cicd-tests (3.11)	24m 59s
engine-tests-docker (mssql)	1m 35s
engine-tests-docker (spark)	5m 34s
engine-tests-docker (duckdb)	1m 24s
engine-tests-docker (clickhouse)	2m 57s
engine-tests-docker (trino)	8m 4s
engine-tests-docker (risingwave)	2m 47s
engine-tests-docker (postgres)	3m 0s
engine-tests-docker (mysql)	1m 45s
ui-style	0s
ui-test	0s
engine-tests-cloud	-1s
	2h 53m 56s

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