Update re_test-integration-prepare.yml

[MarcAstr0]

Description

Integration tests have been failing due to the following error:

Unable to determine Terraform version: Error: Terraform CLI not present - Please install a current version https://learn.hashicorp.com/terraform/getting-started/install.html

It seems to be related to the fact that Terraform is no longer part of the ubuntu-latest image being used by the actions runner (see this discussion).

Changes

• Adds a step for installing Terraform to re_test-integration-prepare.yml.

Checks

• Project Builds
• Project passes tests and checks
• Updated documentation accordingly

[what-the-diff]

PR Summary

• Added Terraform Installation to Workflow
  This update includes a new step in the project's GitHub Actions workflow that automatically installs Terraform. This allows the team to utilize Terraform's infrastructure management capabilities, enhancing the project's deployment processes.