TEP-0147 surface artifacts through termination message

[ericzzzzzzz]

• This is part of TEP-0147 Phase 1 implementation Plan TEP-0147 Phase 1 implementation Plan  #7693
• the artifacts will be written to $(steps.artifacts.path) which is resolved to /tekton/steps//artifacts/provenance.json in step container at runtime.
• A step should be able to consume artifacts from previous steps by referencing the following
  • $(steps.<step-name>.outputs) to get the first artifact from outputs
  • $(steps.<step-name>.outputs.<artifact_name>) to get specific artifact

[ericzzzzzzz]

/assign ericzzzzzzz