refactor: replace terraform with opentofu

Description

This MR replaces terraform executable with open tofu, so we are not affected by any negative license change.

Supporting information

https://tasks.opencraft.com/browse/SE-6135

Testing instructions

Steps to test the changes:

1. Check this step passing: https://gitlab.com/opencraft/ops/grove-cluster-test-do/-/jobs/6592016565 (the MFE build is not relevant)

Dependencies

NA

Screenshots

NA

Checklist

If any of the items below is not applicable, do not remove them, but put a check in it.

• All providers include the new feature/change
• All affected providers can provision new clusters
• Unit tests are added/updated
• Documentation is added/updated
• The TOOLS_CONTAINER_IMAGE_VERSION in ci_vars.yml is updated
• The grove-template repository is updated

Additional context

NA