Repository navigation

Query sites through WP_Site_Query in `wp site list` (#639) #1140

Job	Run time
code-quality / Lint GitHub Actions workflows	7s
code-quality / Lint PHP files	24s
code-quality / PHPCS	24s
code-quality / Lint Gherkin Feature files	11s
code-quality / Spell check	4s
code-quality / PHPStan	35s
	1m 45s