Make ignoreVersionConflict configurable in remote backend

[cedrickring]

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Issue details

Currently it's not possible to override this setting of the remote backend. As a result, the version of the tfe workspace/server must exactly match the bundled (I hope thats the correct term) terraform version. Unfortunately, this makes upgrading the package impossible without upgrading the tfe server too.

Making this configurable, would allow (dangerously) ignoring the version mismatch and thus would allow using newer version of this library with older tfe server versions. As this library only intends to read the remote state, I don't think it's dangerous to set that flag.

Affected area/feature

This would only affect the reading of remote state references (as far as I can see).

I'd be happy to provide a PR for that, however I don't know yet if this would be an intended feature by the Pulumi devs.