Add OpenTofu setup and configuration for AWS infrastructure

- Create action for setting up OpenTofu environment
- Update Terraform workflow to use OpenTofu for infrastructure management
- Modify backend configuration for S3 with new bucket and region
- Add S3 bucket resources with lifecycle configuration
- Update local variables and remove deprecated files
- Include required Python packages for OpenTofu

.github/actions/setup-opentofu/action.yml

@@ -0,0 +1,15 @@
+name: Setup OpenTofu Environment
+description: Prepare the environment for A13labs CI/CD pipelines
+
+runs:
+  using: "composite"
+  steps:
+    - name: Setup OpenTofu
+      uses: opentofu/setup-opentofu@v1
+      with:
+        terraform_version: 1.9.1
+
+    - name: Install required python packages
+      shell: bash
+      run: |
+        python3 -m pip install -r requirements/opentofu.txt