Add new java-node-combined image based on official openjdk-21 image #6

Job	Run time
build-images (cekit-builder) / build_and_push	1m 24s
build-images (devspaces-nodejs-18) / build_and_push	1m 12s
build-images (devspaces-java-node-combined) / build_and_push	1m 26s
build-images (devspaces-base) / build_and_push	1m 20s
build-images (devspaces-openjdk-17) / build_and_push	58s
	6m 20s

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