MKT-67: Add blog markdown content pipeline #22087

Job	Run time
check-translations	44s
knip	51s
check-openrouter-api-key	4s
platform-unit-test (windows-latest)	11m 0s
compile	2m 41s
platform-unit-test (ubuntu-latest)	5m 55s
integration-test	3m 30s
	24m 45s

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