Bubble up Pod failures in Build

[shashwathi]

Expected Behavior

Pod Pending, Unknown phases should also be bubbled to the build controller

Actual Behavior

Only pod Failure status is bubbled up in Build controller.

Steps to Reproduce the Problem

1. Deploy

apiVersion: build.knative.dev/v1alpha1
kind: Build
metadata:
  name: failed-build
  labels:
    expect: failed
spec:
  steps:
  - name: write
    image: ubuntu:latest
    command: ["/bin/bash"]
    args: ["-c", "echo stuff > /workspace/stuff"]
  nodeSelector:
    disktype: fakessd

[Above example assumes there is no node with fakessd label ]
2. kubectl describe build failed-build does not have any status update the issue

/area API
/kind bug
/kind dev

/assign @shashwathi

Additional Info

1. Update build status msg/reason for PENDING and Unknown pod phases.

[shashwathi]

This bug was surfaced when we were writing e2e tests for PR.

Notes from discussion with @imjasonh

• Pod does not have deadlines error like deployment so build controller needs to trigger timeout if build resources are pending (like pods without specific node selectors).