Merge split UPE tests with main gateway tests #10818

Job	Run time
WC - latest \| wcpay - merchant	12m 35s
WC - latest \| wcpay - merchant	12m 35s
WC - latest \| wcpay - shopper	15m 9s
WC - latest \| wcpay - shopper	15m 9s
WC - latest \| subscriptions - merchant	5m 4s
WC - latest \| subscriptions - merchant	5m 4s
WC - latest \| subscriptions - shopper	6m 47s
WC - latest \| subscriptions - shopper	6m 47s
WC - latest \| upe - shopper	5m 38s
WC - latest \| upe - shopper	6m 1s
	1h 30m 49s

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