fix(cli): coerce plan --min-intervals to int #4023

Job	Run time
changes	6s
test-dbt-versions (1.7)	1m 41s
test-dbt-versions (1.8)	1m 39s
test-dbt-versions (1.3)	1m 38s
test-dbt-versions (1.6)	1m 38s
test-dbt-versions (1.5)	1m 32s
test-dbt-versions (1.10)	1m 27s
test-dbt-versions (1.4)	1m 20s
test-dbt-versions (1.9)	1m 52s
test-vscode	0s
test-vscode-e2e	0s
cicd-tests-windows	12m 7s
doc-tests	31s
migration-test	1m 27s
style-and-cicd-tests (3.11)	25m 24s
style-and-cicd-tests (3.13)	21m 51s
style-and-cicd-tests (3.10)	25m 16s
engine-tests-docker (spark)	5m 27s
engine-tests-docker (duckdb)	1m 47s
style-and-cicd-tests (3.9)	22m 58s
engine-tests-docker (mssql)	1m 57s
engine-tests-docker (trino)	8m 32s
engine-tests-docker (postgres)	2m 50s
engine-tests-docker (clickhouse)	2m 51s
style-and-cicd-tests (3.12)	22m 20s
engine-tests-docker (starrocks)	2m 49s
engine-tests-docker (mysql)	1m 51s
engine-tests-docker (risingwave)	3m 0s
ui-test	-1s
ui-style	-1s
engine-tests-cloud	-1s
	2h 55m 48s

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