Tests

Added a CI job for WPCloud testing of wpcomsh. #77832

Job	Run time
Determine tests matrix	6s
Storybook tests	50s
Static analysis	4m 50s
Check plugin monorepo dep versions	33s
PHP tests: PHP 7.2 WP latest	2m 25s
PHP tests: PHP 7.3 WP latest	2m 52s
PHP tests: PHP 7.4 WP latest	3m 3s
PHP tests: PHP 8.0 WP latest	2m 34s
PHP tests: PHP 8.1 WP latest	2m 32s
PHP tests: PHP 8.2 WP latest	1m 54s
PHP tests: PHP 8.3 WP latest	1m 55s
PHP tests: PHP 7.0 WP previous	3m 1s
PHP tests: PHP 8.2 WP previous	2m 35s
PHP tests: PHP 8.2 WP trunk	3m 1s
PHP tests: PHP 7.4 WP latest with WooCommerce	1m 12s
PHP tests: PHP 8.1 WP latest with wpcomsh	3m 1s
JS tests	1m 27s
	37m 51s

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