fix: remove unnecessary init container status checks. Fixes #14495

[jswxstw]

Fixes #14495

Motivation

Workflow stucks Running when initContainer in containerSet fails.

Modifications

Remove unnecessary init container status checks because pod will turn to Failed if init container fails.
All nodes including container node will be Failed if pod fails.

Verification

metadata:
  name: hello-world-containerset-initcontainerfails
spec:
  entrypoint: hello-world
  templates:
    - name: hello-world
      dag:
        tasks:
          - name: containerset
            template: containerset
    - name: containerset
      containerSet:
        containers:
          - name: hello
            image: alpine:latest
            command: [sh, -c]
            args: ["echo hello"]
          - name: world
            image: alpine:latest
            command: [sh, -c]
            args: ["echo world"]
      initContainers:
        - name: setup
          image: alpine:latest
          command: [sh, -c]
          args: ["echo intentional failure; exit 1"]

Documentation

[jswxstw]

/retest