Fix WooPay opt-in blocks field (#9131) #22873

Job	Run time
Generate the matrix for subscriptions-tests dynamically	1s
WP - nightly \| WC - latest \| wcpay - merchant	16m 19s
WP - nightly \| WC - latest \| wcpay - shopper	50m 12s
WP - nightly \| WC - latest \| subscriptions - merchant	6m 31s
WP - nightly \| WC - latest \| subscriptions - shopper	8m 27s
WC - 7.7.0 \| wcpay - merchant	15m 47s
WC - 7.7.0 \| wcpay - shopper	48m 31s
WC - 7.7.0 \| subscriptions - merchant	6m 31s
WC - 7.7.0 \| subscriptions - shopper	8m 29s
WC - latest \| wcpay - merchant	16m 8s
WC - latest \| wcpay - shopper	51m 30s
WC - latest \| subscriptions - merchant	6m 15s
WC - latest \| subscriptions - shopper	8m 36s
WC - beta \| wcpay - merchant	16m 30s
WC - beta \| wcpay - shopper	50m 3s
WC - beta \| subscriptions - merchant	6m 22s
WC - beta \| subscriptions - shopper	8m 27s
	5h 24m 39s

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