fix: require `stream_count >= 1` on `DynamicStreamCheckConfig` #4679

Job	Run time
Get Changes	6s
Check: source-pokeapi	1m 58s
Check: source-hardcoded-records	2m 39s
Skipped Check: source-google-drive	4s
Check: source-shopify	1h 24m 54s
Check: destination-motherduck	2m 53s
Check: source-intercom	3m 21s
	1h 35m 55s

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