Add E2E tests for merchant multi-currency setup (#7918) #21303

Job	Run time
Generate the matrix for subscriptions-tests dynamically	1s
WP - nightly \| WC - latest \| wcpay - merchant	12m 4s
WP - nightly \| WC - latest \| wcpay - shopper	13m 54s
WP - nightly \| WC - latest \| subscriptions - merchant	4m 52s
WP - nightly \| WC - latest \| subscriptions - shopper	6m 51s
WC - 7.7.0 \| wcpay - merchant	11m 47s
WC - 7.7.0 \| wcpay - shopper	13m 49s
WC - 7.7.0 \| subscriptions - merchant	4m 41s
WC - 7.7.0 \| subscriptions - shopper	6m 35s
WC - latest \| wcpay - merchant	12m 10s
WC - latest \| wcpay - shopper	14m 22s
WC - latest \| subscriptions - merchant	4m 48s
WC - latest \| subscriptions - shopper	6m 39s
WC - beta \| wcpay - merchant	12m 7s
WC - beta \| wcpay - shopper	14m 8s
WC - beta \| subscriptions - merchant	4m 55s
WC - beta \| subscriptions - shopper	6m 46s
	2h 30m 29s

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