ci: install s3 and slack extras in CI to verify they work

Co-Authored-By: Itamar Hartstein <haritamar@gmail.com>

Author: devin-ai-integration[bot]

.github/workflows/test-warehouse.yml

@@ -216,9 +216,9 @@ jobs:
           # using ".[vertica]" would re-resolve dbt-vertica's deps and downgrade
           # dbt-core to ~=1.8.  Install elementary without the adapter extra.
           if [ "${{ inputs.warehouse-type }}" = "vertica" ]; then
-            pip install "."
+            pip install ".[s3,slack]"
           else
-            pip install ".[${{ (inputs.warehouse-type == 'databricks_catalog' && 'databricks') || inputs.warehouse-type }}]"
+            pip install ".[${{ (inputs.warehouse-type == 'databricks_catalog' && 'databricks') || inputs.warehouse-type }},s3,slack]"
           fi
 
       - name: Write dbt profiles