Add STDIN support to wp media import #340

Job	Run time
code-quality / Spell check	4s
code-quality / Lint PHP files	20s
code-quality / Lint Gherkin Feature files	12s
code-quality / PHPStan	22s
code-quality / PHPCS	22s
code-quality / Lint GitHub Actions workflows	9s
	1m 29s

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