Fix UPE styles extraction in the Site Editor (#10433) #24414

Job	Run time
Generate the matrix for subscriptions-tests dynamically	1s
WP - nightly \| WC - latest \| wcpay - merchant	16m 34s
WP - nightly \| WC - latest \| wcpay - shopper	23m 21s
WP - nightly \| WC - latest \| subscriptions - merchant	4m 54s
WP - nightly \| WC - latest \| subscriptions - shopper	6m 41s
WC - 7.7.0 \| wcpay - merchant	16m 39s
WC - 7.7.0 \| wcpay - shopper	20m 4s
WC - 7.7.0 \| subscriptions - merchant	5m 7s
WC - 7.7.0 \| subscriptions - shopper	6m 26s
WC - latest \| wcpay - merchant	16m 57s
WC - latest \| wcpay - shopper	21m 15s
WC - latest \| subscriptions - merchant	5m 45s
WC - latest \| subscriptions - shopper	6m 52s
WC - beta \| wcpay - merchant	18m 50s
WC - beta \| wcpay - shopper	21m 38s
WC - beta \| subscriptions - merchant	5m 7s
WC - beta \| subscriptions - shopper	6m 28s
	3h 22m 39s

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