server: restarted pull_request labeled builds missing steps

[plyr4]

see title, use the following yaml, trigger a build, restart it. build will be missing the labeled step

  - name: pull-labeled-with-bug
    image: golang
    ruleset:
      event: 'pull_request:labeled'
      label: [ 'bug' ]
    commands:
      - echo "pull request labeled"

  - name: run-always
    image: golang
    commands:
      - echo "run always"

[ecrupper]

This extends to comment steps with additional comment specification, e.g.

  - name: comment-with-bug
    image: golang
    ruleset:
      event: comment
      comment: "test suite"
    commands:
      - echo "running comment-driven test suite"

  - name: run-always
    image: golang
    commands:
      - echo "run always"

[wass3r]

Either we implement saving the state or document and prevent ability to restart these types of events.

[wass3r]

re Easton's comment, we have this out there #453 as well