re-allow using RelatedNode as input to cardinality=one rel #1078

Job	Run time
Detect which file has changed	5s
prepare-environment / prepare	9s
markdown-lint	6s
python-lint	7s
yaml-lint	0s
action-lint	0s
documentation	46s
validate-generated-documentation	44s
unit-tests (3.9)	1m 21s
unit-tests (3.11)	1m 21s
unit-tests (3.10)	1m 25s
integration-tests-latest-infrahub	7m 55s
validate-documentation-style	12s
unit-tests (3.13)	4m 41s
unit-tests (3.12)	1m 36s
	20m 28s

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