core: frontend: MainView: Add video thumbnails #2090

Job	Run time
python-tests	3m 6s
frontend-tests	2m 11s
deploy-docker-images (bootstrap, blueos, linux/arm/v7,linux/arm64/v8,linux/amd64)	3m 8s
deploy-docker-images (core, blueos, linux/arm/v7,linux/arm64/v8,linux/amd64)	10m 1s
deploy-raspberry-image	0s
	18m 26s

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