Install terraform required to run tests

[dudeperf3ct]

Terraform binary is required for CI to pass.

The above requirement is an anti-pattern and should not be recommended. Ideally, we should mock self.tfs.terraform_client.output method under mocked_resource_template_runner and mocked_resource_template_runner.

Checklist

Please ensure you have done the following:

• I have read the CONTRIBUTING guide.
• I have updated the documentation if required.
• I have added tests which cover my changes.

Type of change

Tick all those that apply:

• Bug Fix (non-breaking change, fixing an issue)
• New feature (non-breaking change to add functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Other (add details above)