fix: remove duplicate test_integration_tmp key in deploy workflow

The paths-filter YAML had test_integration_tmp defined twice (lines 71
and 90), causing a "duplicated mapping key" parse error that blocked all
deploy runs.

Author: jpr5

.github/workflows/showcase_deploy.yml

@@ -68,8 +68,6 @@ jobs:
               - 'showcase/shared/**'
               - 'showcase/scripts/**'
               - 'showcase/packages/*/manifest.yaml'
-            test_integration_tmp:
-              - 'showcase/packages/test-integration-tmp/**'
             langgraph: 'showcase/packages/langgraph-python/**'
             mastra: 'showcase/packages/mastra/**'
             crewai_crews: 'showcase/packages/crewai-crews/**'