fix(tofu): prompt for auth on workspace subcommand

[yashpy]

Summary

Adds workspace to the list of subcommands requiring authentication in the OpenTofu plugin (plugins/tofu/terraform.go).

Previously, running commands like tofu workspace select or tofu workspace list did not trigger credential injection.

Fixes #618

[Copilot]

✅ Ready to approve

The change is a minimal, verified parity fix with the Terraform plugin and directly addresses the reported missing NeedsAuth rule.

Note: this review does not count toward required approvals for merging.

Pull request overview

Aligns the OpenTofu plugin’s authentication triggering behavior with the Terraform plugin by ensuring tofu workspace … subcommands prompt for credential injection when appropriate (fixing #618).

Changes:

• Added needsauth.ForCommand("workspace") to the OpenTofu plugin’s NeedsAuth rules so workspace operations trigger auth/credential injection.

File summaries

File	Description
plugins/tofu/terraform.go	Adds workspace to the auth-gated subcommands list, matching the Terraform plugin behavior.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Low

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