fix: subscriptions with free trial in ECE #354

Job	Run time
Generate test matrix	5s
Build plugin	4m 13s
shopper \| WC latest \| PHP 8.3 / Run tests	20m 10s
subscriptions \| WC 9.9.6 \| PHP 8.3 / Run tests	5m 44s
merchant \| WC 9.9.6 \| PHP 8.3 / Run tests	15m 30s
merchant \| WC latest \| PHP 8.3 / Run tests	15m 32s
shopper \| WC 9.9.6 \| PHP 8.3 / Run tests	19m 45s
subscriptions \| WC latest \| PHP 8.3 / Run tests	5m 54s
	1h 26m 53s

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