revert(azure-pipelines): use pool on job level

.azure-pipelines/templates/service.yaml

@@ -81,12 +81,12 @@ jobs:
       - ${{ each dep in parameters.service.dependsOn }}:
         - ${{ dep }}
     condition: in(dependencies.ImageBuild_${{parameters.service.name}}.result, 'Succeeded', 'Skipped')
+    pool: ${{ parameters.service.pool }}
     container:
       # TODO: use BuildNumber instead of latest in update branches
       # image: devfra.azurecr.io/de.fraport.fradrive.build/frontend:$(Build.BuildNumber)
       image: $(imageUpstream)/${{parameters.service.name}}:latest
       endpoint: devfra
-      pool: ${{ parameters.service.pool }}
       env:
         PROJECT_DIR: $(Build.Repository.LocalPath)
         IN_CONTAINER: true