Tests

Added a CI job for WPCloud testing of wpcomsh. #75696

Job	Run time
Storybook tests	56s
Determine tests matrix	7s
Static analysis	1m 58s
Check plugin monorepo dep versions	33s
PHP tests: PHP 7.2 WP latest	1m 15s
PHP tests: PHP 7.3 WP latest	1m 21s
PHP tests: PHP 7.4 WP latest	1m 15s
PHP tests: PHP 8.0 WP latest	1m 15s
PHP tests: PHP 8.1 WP latest	1m 21s
PHP tests: PHP 8.2 WP latest	1m 12s
PHP tests: PHP 8.3 WP latest	1m 21s
PHP tests: PHP 7.0 WP previous	1m 21s
PHP tests: PHP 8.2 WP previous	1m 5s
PHP tests: PHP 8.2 WP trunk	1m 12s
PHP tests: PHP 7.4 WP latest with WooCommerce	1m 23s
PHP tests: PHP 8.1 WP latest with wpcomsh	1m 15s
JS tests	1m 15s
	20m 5s

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