Replace `data "aws_iam_policy_document"` with manual `jsonencode` #108

Job	Run time
meta	4s
prettier	7s
codegen-freshness	10s
terraform-fmt	5s
typos	3s
tflint	15s
terraform-validate (asset-account/terraform/cloudformation-stack/examples/basic)	11s
terraform-docs (./connector/terraform)	6s
terraform-validate (asset-account/terraform/stack-set/examples/self-managed)	14s
terraform-docs (./connector/terraform/modules/nat-provision)	8s
terraform-validate (asset-account/terraform/stack-set/examples/service-managed)	14s
terraform-docs (./connector/terraform/modules/region)	10s
terraform-validate (connector/terraform/examples/advanced)	11s
terraform-docs (./connector/terraform/modules/account)	6s
terraform-validate (connector/terraform/examples/basic)	10s
terraform-docs (./iam-policies/terraform)	10s
terraform-validate (iam-policies/terraform/examples/basic)	13s
terraform-docs (./asset-account/terraform/cloudformation-stack)	6s
terraform-docs (./asset-account/terraform/stack-set)	6s
	2m 49s

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