Allows subscription quantities of zero on Pricing instances #514

Job	Run time
Integration test with react-recurly	55s
Unit test (Safari-Remote)	10m 25s
Check	55s
Unit test (Edge-Remote)	8m 56s
Unit test (Chrome)	1m 28s
Unit test (iOS-16-Remote)	7m 49s
Unit test (Firefox)	1m 19s
Unit test (iOS-15-Remote)	8m 39s
Unit test (Electron)	1m 31s
Unit test (Android-13-Remote)	12m 20s
Unit test (Android-12-Remote)	12m 2s
Unit test (Android-11-Remote)	6m 21s
End-to-end test	0s
Verify required checks	1s
Publish artifacts	0s
	1h 12m 41s

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