Enable terraform validate pre-commit hook

This hook should now work as expected in most, if not all of our repos 
now that we are finally updating to terraform 0.13.x (on our way to 
1.0.x).

.pre-commit-config.yaml

@@ -117,22 +117,7 @@ repos:
     rev: v1.50.0
     hooks:
       - id: terraform_fmt
-      # There are ongoing issues with how this command works. This issue
-      # documents the core issue:
-      # https://github.com/hashicorp/terraform/issues/21408
-      # We have seen issues primarily with proxy providers and Terraform code
-      # that uses remote state. The PR
-      # https://github.com/hashicorp/terraform/pull/24887
-      # has been approved and is part of the 0.13 release to resolve the issue
-      # with remote states.
-      # The PR
-      # https://github.com/hashicorp/terraform/pull/24896
-      # is a proprosed fix to deal with `terraform validate` with proxy
-      # providers (among other configurations).
-      # We have decided to disable the terraform_validate hook until the issues
-      # above have been resolved, which we hope will be with the release of
-      # Terraform 0.13.
-      # - id: terraform_validate
+      - id: terraform_validate
 
   # Docker hooks
   - repo: https://github.com/IamTheFij/docker-pre-commit