Instead of selecting the workspace, set the `TF_WORKSPACE` env var

[nitrocode]

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Describe the Feature

Instead of selecting the workspace, set the TF_WORKSPACE env var to speed up the atmos process and have one less command that atmos needs to run

https://www.terraform.io/cli/config/environment-variables#tf_workspace

Expected Behavior

atmos selects a workspace based using the env var instead of a raw command. One less command.

[Gowiem]

@nitrocode love this idea -- Looking forward to seeing it implemented!