Added a CI job for WPCloud testing of wpcomsh. #68051

Job	Run time
Changelogger use	15s
detect changed files	8s
Changelogger validity	28s
Copied files are in sync	7s
Project structure	1m 22s
PHP lint (7.2)	28s
PHP Code Sniffer (non-excluded files only)	1m 54s
PHP Compatibility	1m 13s
PHP lint (7.4)	29s
ESLint (non-excluded files only)	0s
PHP Code Sniffer (changes to excluded files only)	0s
ESLint (changes to excluded files only)	0s
PHP lint (8.0)	31s
Lint GitHub Actions yaml files	24s
PHP lint (8.1)	36s
Lock files are up to date	0s
Check linter exclude lists	0s
PHP lint (8.2)	34s
PHP lint (8.3)	28s
PHP lint (8.4)	31s
Monorepo package version refs	0s
	9m 28s

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