Improve parsing of tf files #691

Job	Run time
asdf	33s
latest	31s
TERRAFORM_VERSION range	34s
Get version constraint from hard to parse file	32s
Local State file	31s
Prefer OpenTofu, but only Terraform matches constraints	31s
OPENTOFU_VERSION with tofu action	35s
OPENTOFU_VERSION pre-release with tofu action	30s
provider versions	55s
Remote State file	3m 41s
specific required_version	28s
required_version range	27s
required_version with a v prefix	41s
OPENTOFU_VERSION with terraform action	28s
TFC Cloud Configuration	2m 23s
Partial TFC Cloud Configuration with tags	1m 33s
Partial TFC Cloud Configuration	1m 54s
TFC Workspace	1m 40s
tfenv	28s
tfswitch	31s
tofuenv	30s
	19m 56s

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