Bug fix: Terraform workspace command returns zero exit code when given an invalid argument.

[twittyc]

The Terraform workspace command will return a 0 return code even when invalid arguments are passed to the command.
For example, terraform workspace seleect will return a 0 (non-error) return code even though it's an invalid command. This PR updates the Run method to fall in line with other terraform commands and returns a proper non-zero return code when an invalid argument is passed to terraform workspace.

➜  linux_amd64 git:(twittyc/terraformWorkspaceInvalidArgsReturnsNon0) terraform workspace seleect
Usage: terraform [global options] workspace

  new, list, show, select and delete Terraform workspaces.
➜  linux_amd64 git:(twittyc/terraformWorkspaceInvalidArgsReturnsNon0) echo $?
0

This fix updates the return code to properly give an error

➜  linux_amd64 git:(twittyc/terraformWorkspaceInvalidArgsReturnsNon0) terraform workspace seleect
Usage: terraform [global options] workspace

  new, list, show, select and delete Terraform workspaces.
➜  linux_amd64 git:(twittyc/terraformWorkspaceInvalidArgsReturnsNon0) echo $?
1

go tests pass. Let me know if I need to do anything else or if you have any feedback :)

[hashicorp-cla]

All committers have signed the CLA.

[twittyc]

This closes #31317

[crw]

Thanks for this submission! Although I cannot commit to having this PR reviewed at this time, we acknowledge your contribution and appreciate it!

[github-actions]

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[github-actions]

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