chore: ignore local OpenTofu state and working directories

[geojaz]

Running a stack under tf/ leaves .terraform/, a provider lock file, and
terraform.tfstate in the stack directory. None of it is source and all of it is
machine and run specific.

It is also actively harmful to commit: a terraform.tfstate that still references a
torn-down kind cluster makes the next tofu run in that directory fail on refresh with
"could not locate any control plane nodes", before it gets anywhere near applying.

[kubernetes-prow]

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[kubernetes-prow]

Hi @geojaz. Thanks for your PR.

I'm waiting for a kubernetes-sigs member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work.

Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes-sigs/prow repository.