Pull Requests should trigger an action that validates Terraform code for syntactical correctness and style

[glennmusa]

Description

There should be an action triggered by Pull Requests that validate and lint Terraform code so that all modules are able to be initialized without issue and share a common format.

Acceptance Criteria

• Some workflow is triggered on Pull Request
• The workflow runs terraform validate and terraform fmt -check on all .tf in the repository
• The workflow fails the run if validation errors or formatting errors are present