Port duplicate pod test from knative/build 🏗
Port duplicate pod test from knative/build 🏗

knative/build had a bug where duplicate pods can be created. This was
cause by a possible race condition between pod creation and start ; if
a `reconcile` run starts in this time, it would create duplicate pods.

This port the knative/build test (knative/build#519 and
knative/build#562) to tektoncd/build-pipeline.

Signed-off-by: Vincent Demeester <b98c0fd48a8945096c766de790fe70420dd2f223@redhat.com>

tektoncd/pipeline,tektoncd/pipeline