Added a CI job for WPCloud testing of wpcomsh. #77763

Job	Run time
Determine tests matrix	7s
Static analysis	4m 58s
Check plugin monorepo dep versions	33s
Storybook tests	56s
PHP tests: PHP 7.2 WP latest	2m 37s
PHP tests: PHP 7.3 WP latest	2m 31s
PHP tests: PHP 7.4 WP latest	2m 30s
PHP tests: PHP 8.0 WP latest	2m 32s
PHP tests: PHP 8.1 WP latest	2m 50s
PHP tests: PHP 8.2 WP latest	2m 13s
PHP tests: PHP 8.3 WP latest	1m 53s
PHP tests: PHP 7.0 WP previous	2m 40s
PHP tests: PHP 8.2 WP previous	2m 30s
PHP tests: PHP 8.2 WP trunk	2m 37s
PHP tests: PHP 7.4 WP latest with WooCommerce	1m 16s
PHP tests: PHP 8.1 WP latest with wpcomsh	2m 35s
JS tests	1m 20s
	36m 38s

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