embed youtube (html) in markdown (#7099) #21255

Job	Run time
setup	5s
Build	10m 8s
BuildFrontend	4m 48s
FrontendTests	6m 30s
CypressTests	24m 45s
Tests (2.12)	18m 21s
SlowTests (2.12)	11m 26s
Tests (2.13)	13m 6s
SlowTests (2.13)	10m 51s
IntegrationTests (2.12)	9m 37s
IntegrationTests (2.13)	9m 18s
publish	22m 48s
trigger-external-build (nussknacker-helm, helm-test-workflow.yaml, main)	2s
trigger-external-build (nussknacker-quickstart, pr.yml, staging)	4s
trigger-external-build (nussknacker-sample-components, pr.yml, staging)	3s
trigger-external-build (nussknacker-flink-compatibility, test.yml, staging)	3s
	2h 21m 55s

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