dev - Fix the flaky test in WC_Payments_Incentives_Service_Test (#10472) #24421

Job	Run time
Generate the matrix for subscriptions-tests dynamically	1s
WP - nightly \| WC - latest \| wcpay - merchant	17m 30s
WP - nightly \| WC - latest \| wcpay - shopper	23m 15s
WP - nightly \| WC - latest \| subscriptions - merchant	4m 55s
WP - nightly \| WC - latest \| subscriptions - shopper	7m 29s
WC - 7.7.0 \| wcpay - merchant	16m 42s
WC - 7.7.0 \| wcpay - shopper	19m 33s
WC - 7.7.0 \| subscriptions - merchant	4m 53s
WC - 7.7.0 \| subscriptions - shopper	6m 16s
WC - latest \| wcpay - merchant	16m 40s
WC - latest \| wcpay - shopper	20m 19s
WC - latest \| subscriptions - merchant	4m 49s
WC - latest \| subscriptions - shopper	6m 44s
WC - beta \| wcpay - merchant	17m 1s
WC - beta \| wcpay - shopper	20m 33s
WC - beta \| subscriptions - merchant	5m 2s
WC - beta \| subscriptions - shopper	6m 27s
	3h 18m 9s

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