Use template type for StateFactory methods to assist IDEs better. (#7… #20917

Job	Run time
Generate the matrix for subscriptions-tests dynamically	3s
WP - nightly \| WC - latest \| wcpay - merchant	13m 58s
WP - nightly \| WC - latest \| wcpay - shopper	14m 36s
WP - nightly \| WC - latest \| subscriptions - merchant	7m 44s
WP - nightly \| WC - latest \| subscriptions - shopper	9m 42s
WC - 7.7.0 \| wcpay - merchant	14m 7s
WC - 7.7.0 \| wcpay - shopper	16m 44s
WC - 7.7.0 \| subscriptions - merchant	7m 10s
WC - 7.7.0 \| subscriptions - shopper	7m 48s
WC - latest \| wcpay - merchant	18m 49s
WC - latest \| wcpay - shopper	16m 37s
WC - latest \| subscriptions - merchant	6m 56s
WC - latest \| subscriptions - shopper	8m 29s
WC - beta \| wcpay - merchant	15m 10s
WC - beta \| wcpay - shopper	14m 33s
WC - beta \| subscriptions - merchant	7m 20s
WC - beta \| subscriptions - shopper	9m 47s
	3h 9m 33s

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