Ensure json var-files have a .json extension #749

Job	Run time
Remote State file	2m 45s
Local State file	19s
TERRAFORM_VERSION range	20s
tfswitch	23s
TFC Workspace	46s
OPENTOFU_VERSION with terraform action	34s
Prefer OpenTofu, but only Terraform matches constraints	21s
required_version range	19s
Partial TFC Cloud Configuration	51s
latest	23s
Partial TFC Cloud Configuration with tags	58s
OPENTOFU_VERSION pre-release with tofu action	26s
Get version constraint from hard to parse file	22s
required_version with a v prefix	19s
tfenv	23s
asdf	20s
TFC Cloud Configuration	50s
tofuenv	20s
Version detection on arm	1m 33s
specific required_version	19s
provider versions	33s
OPENTOFU_VERSION with tofu action	21s
	13m 45s

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