Add String() for OpTypeDecodeVarsReferences

[radeksimko]

This is mostly for convenience in debug messages, which otherwise come through as not-very-descriptive OpType(9).

[dbanck]

LGTM!

I think I missed running some code generation when adding the variable reference back then?

[radeksimko]

I think I missed running some code generation when adding the variable reference back then?

go generate internal/terraform/module/operation

is the magic command.

And yeah - it's easy to miss - I suppose we could add some checks in CI, but given how often we add new types I'm not sure it's worth the effort. 🤷🏻

[github-actions]

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