fix: ProductUnion interface added (#797) #948

Job	Run time
Running Automated Tests w/ WPBrowser in WordPress v6.3 on PHP8.1	4m 27s
Running Automated Tests w/ WPBrowser in WordPress v6.2 on PHP8.1 with HPOS activated	3m 38s
Running Automated Tests w/ WPBrowser in WordPress v6.1 on PHP8.1 in Debug Mode	4m 25s
Running Automated Tests w/ WPBrowser in WordPress v6.0 on PHP8.1	3m 18s
Running Automated Tests w/ WPBrowser in WordPress v6.3 on PHP8.0	3m 13s
Running Automated Tests w/ WPBrowser in WordPress v6.2 on PHP8.0 with HPOS activated	3m 53s
Running Automated Tests w/ WPBrowser in WordPress v6.1 on PHP8.0	4m 20s
Running Automated Tests w/ WPBrowser in WordPress v6.0 on PHP8.0	3m 21s
Running Automated Tests w/ WPBrowser in WordPress v6.3 on PHP7.4	5m 52s
Running Automated Tests w/ WPBrowser in WordPress v6.2 on PHP7.4 with HPOS activated with Codecoverage	18m 53s
Running Automated Tests w/ WPBrowser in WordPress v6.1 on PHP7.4	5m 59s
Running Automated Tests w/ WPBrowser in WordPress v6.0 on PHP7.4	7m 14s
	1h 8m 33s

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