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Query sites through WP_Site_Query in `wp site list` #1131

Job	Run time
code-quality / Lint GitHub Actions workflows	6s
code-quality / Spell check	6s
code-quality / Lint PHP files	14s
code-quality / Lint Gherkin Feature files	8s
code-quality / PHPCS	25s
code-quality / PHPStan	36s
	1m 35s