spiffxp: config/jobs: add back 'Deploying prow:' text

JobBuild
23057
07-28 22:47
pull-test-infra-bazel 1420516060737572864
pull-test-infra-gubernator 1420516060808876032
pull-test-infra-integration 1420516060943093760
pull-test-infra-prow-checkconfig 1420516060909539328
pull-test-infra-verify-file-perms 1420516060842430464
pull-test-infra-yamllint 1420516060875984896