ci: add collect-modules action #36

Job	Run time
terraform-fmt	4s
terraform-validate (asset-account/terraform/stack-set/examples/self-managed)	13s
prettier	7s
terraform-validate (asset-account/terraform/stack-set/examples/service-managed)	12s
collect-modules	3s
typos	4s
terraform-docs (./asset-account/terraform/stack-set)	6s
	49s

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