fix: add RAG projects to scheduled cleanup and unify project vars (#800)

Add asp-rag-dev/stg/prd to the cleanup project list so test resources
in RAG projects are cleaned up daily. Also remove the redundant
_E2E_PROJECT_IDS substitution since it always matches _PROJECT_IDS.

Author: eliasecchig

.cloudbuild/scheduled-cleanup.yaml

@@ -19,7 +19,7 @@ steps:
     entrypoint: /bin/bash
     env:
       - 'PROJECT_IDS=${_PROJECT_IDS}'
-      - 'E2E_PROJECT_IDS=${_E2E_PROJECT_IDS}'
+      - 'E2E_PROJECT_IDS=${_PROJECT_IDS}'
       - 'CICD_PROJECT_ID=${_CICD_PROJECT_ID}'
     args:
       - "-c"
@@ -34,6 +34,5 @@ options:
   defaultLogsBucketBehavior: REGIONAL_USER_OWNED_BUCKET
 
 substitutions:
-  _PROJECT_IDS: 'asp-e2e-dev,asp-e2e-stg,asp-e2e-prd,asp-test-dev,asp-test-prd,asp-test-stg'
-  _E2E_PROJECT_IDS: 'asp-e2e-dev,asp-e2e-stg,asp-e2e-prd,asp-test-dev,asp-test-prd,asp-test-stg'
+  _PROJECT_IDS: 'asp-e2e-dev,asp-e2e-stg,asp-e2e-prd,asp-test-dev,asp-test-prd,asp-test-stg,asp-rag-dev,asp-rag-stg,asp-rag-prd'
   _CICD_PROJECT_ID: 'asp-e2e-cicd'