allow for configuring pr preview default start and min intervals separately #3778

Job	Run time
changes	8s
test-dbt-versions (1.8)	1m 45s
test-dbt-versions (1.6)	2m 34s
test-dbt-versions (1.9)	2m 2s
test-dbt-versions (1.5)	1m 50s
test-dbt-versions (1.7)	2m 46s
test-dbt-versions (1.10)	1m 48s
test-dbt-versions (1.3)	1m 43s
test-dbt-versions (1.4)	1m 53s
test-vscode-e2e	0s
test-vscode	0s
migration-test	1m 57s
cicd-tests-windows	11m 11s
style-and-cicd-tests (3.9)	1h 15m 6s
style-and-cicd-tests (3.13)	25m 34s
style-and-cicd-tests (3.11)	48m 2s
style-and-cicd-tests (3.12)	24m 35s
style-and-cicd-tests (3.10)	23m 24s
engine-tests-docker (mssql)	2m 10s
engine-tests-docker (clickhouse)	3m 5s
engine-tests-docker (risingwave)	5m 37s
engine-tests-docker (trino)	9m 45s
engine-tests-docker (postgres)	2m 13s
engine-tests-docker (mysql)	2m 8s
engine-tests-docker (duckdb)	25m 15s
engine-tests-docker (starrocks)	6m 2s
engine-tests-docker (spark)	22m 31s
doc-tests	41s
ui-test	0s
ui-style	0s
engine-tests-cloud	0s
	5h 5m 45s

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