Support Terraform 0.14.0 and later -chdir Global Option

Reference: https://github.com/hashicorp/terraform/blob/v0.14/CHANGELOG.md
Reference: https://github.com/hashicorp/terraform/pull/26087
Reference: https://github.com/hashicorp/terraform/issues/25558
Reference: https://github.com/hashicorp/terraform/issues/18030

Terraform commands have historical incompatibilities when executed outside the configuration directory, for example automatic variables files are not properly read. Terraform 0.14.0 (all pre-release versions) introduces a new `-chdir` global option, e.g. `terraform -chdir /path/to/config ` syntax. Later Terraform versions will deprecate the older `terraform /path/to/config` as an argument.

Start by locating the Go entry point that assembles Terraform command arguments and the existing tests for running commands outside the configuration directory. Compare current argument handling with Terraform 0.14's global -chdir syntax and verify behavior against the referenced Terraform changelog and pull request. Done means supported commands can use -chdir while existing command execution tests remain passing.

Written by the indexing model from the issue text.