spiffxp: config/jobs: slow down k8s-infra-ci-robot jobs

JobBuild
23056
07-28 22:07
pull-test-infra-bazel 1420532758094024704 1420506080747720704
pull-test-infra-gubernator 1420532758127579136 1420506080785469440
pull-test-infra-integration 1420532758261796864 1420506080936464384
pull-test-infra-prow-checkconfig 1420532758211465216 1420506080907104256
pull-test-infra-verify-file-perms 1420532758152744960 1420506080831606784
pull-test-infra-yamllint 1420532758182105088 1420506080856772608