Remove `auto_apply` and `auto_destroy` inputs

This change sets removes support `auto_apply` and `auto_destroy` inputs
across the templates.
With the introduction of the `rules` inputs, an auto apply or auto
destroy behavior can easily implemented using it directly.

We can't easily keep the `auto_apply` and `auto_destroy` inputs because
having input references in input default values is not yet supported.
See https://gitlab.com/gitlab-org/gitlab/-/issues/438722.

I've left the input definitions commented out for now with the
possibility to easily bring it back if the issue is resolved.

Closes https://gitlab.com/components/opentofu/-/issues/80

Changelog: removed