allow for configuring pr preview default start and min intervals separately #3777

Job	Run time
test-dbt-versions (1.7)	2m 50s
test-dbt-versions (1.4)	1m 21s
test-dbt-versions (1.5)	1m 30s
test-dbt-versions (1.8)	1m 56s
test-dbt-versions (1.10)	1m 37s
test-dbt-versions (1.3)	1m 35s
test-dbt-versions (1.9)	1m 53s
changes	9s
test-dbt-versions (1.6)	2m 56s
test-vscode	0s
test-vscode-e2e	0s
cicd-tests-windows	12m 2s
style-and-cicd-tests (3.11)	23m 8s
migration-test	1m 56s
style-and-cicd-tests (3.12)	20m 17s
style-and-cicd-tests (3.13)	27m 14s
doc-tests	34s
engine-tests-docker (postgres)	4m 3s
style-and-cicd-tests (3.10)	30m 12s
engine-tests-docker (mssql)	2m 8s
engine-tests-docker (mysql)	3m 20s
engine-tests-docker (duckdb)	9m 28s
engine-tests-docker (trino)	10m 27s
style-and-cicd-tests (3.9)	1h 14m 30s
engine-tests-docker (spark)	5m 13s
engine-tests-docker (risingwave)	3m 17s
engine-tests-docker (clickhouse)	3m 17s
engine-tests-docker (starrocks)	2m 57s
ui-style	0s
ui-test	0s
engine-tests-cloud	0s
	4h 9m 50s

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