fix: update CI workflow and format terraform code

- TFLint: use --minimum-failure-severity=error (warnings don't fail CI)
- Run terraform fmt -recursive for canonical formatting

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: JoshLuedeman

.github/workflows/ci.yml

@@ -62,7 +62,7 @@ jobs:
           GITHUB_TOKEN: ${{ github.token }}
 
       - name: Run TFLint
-        run: tflint --recursive --format compact
+        run: tflint --recursive --format compact --minimum-failure-severity=error
 
   terraform-plan:
     name: "📋 Plan (Validation)"