ci: add api doc generation #1164

Job	Run time
Detect which file has changed	4s
prepare-environment / prepare	3s
yaml-lint	7s
python-lint	6s
action-lint	5s
markdown-lint	5s
validate-generated-documentation	50s
documentation	57s
integration-tests-latest-infrahub	7m 21s
unit-tests (3.10)	1m 20s
check-api-documentation-obsolescence	40s
unit-tests (3.9)	1m 11s
unit-tests (3.11)	1m 18s
unit-tests (3.13)	4m 43s
unit-tests (3.12)	1m 42s
validate-documentation-style	5s
	20m 37s

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