CLI: Accept mulitple node identifiers in `verdi node graph generate` … #1570

Job	Run time
build-amd64 / linux/amd64	2m 22s
test-amd64 (aiida-core-with-services) / test	1m 26s
test-amd64 (aiida-core-base) / test	1m 46s
test-amd64 (aiida-core-dev) / test	2m 33s
build / linux/amd64,linux/arm64	12m 15s
test-arm64 / test	3m 39s
publish-ghcr / release (aiida-core-base)	12s
publish-ghcr / release (aiida-core-with-services)	8s
publish-ghcr / release (aiida-core-dev)	12s
publish-dockerhub / release (aiida-core-base)	17s
publish-dockerhub / release (aiida-core-with-services)	45s
publish-dockerhub / release (aiida-core-dev)	38s
	26m 13s

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