Supply interactiveMode when using exec plugins

[jrhouston]

Description

Fixes #797

Acceptance tests

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Release Note

Release note for CHANGELOG:

Fix exec plugin interactive mode regression

References

Community Note

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[alexsomesan]

LGTM.
I'm wondering if there are any plugins out there which require the "Always" setting. Let's keep an eye out for those - we might need to keep track of them in the provider, or just expose this setting to the user.

[jrhouston]

LGTM. I'm wondering if there are any plugins out there which require the "Always" setting. Let's keep an eye out for those - we might need to keep track of them in the provider, or just expose this setting to the user.

They simply wouldn't be able to use them at present – Terraform doesn't have a way of surfacing stdin from a subprocess of a provider to the user AFAIK.

[github-actions]

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