Cleanup error message for Step container status

[JeromeJu]

Changes

This commit cleans up the error message for the step container status.

part of: #7013
/kind cleanup

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[QuanZhang-William]

/assign

[QuanZhang-William]

Thanks, @JeromeJu. I'd say this PR partially addresses #7013. Could you please update the commit message and PR description.

Otherwise lgtm

[JeromeJu]

Thanks, @JeromeJu. I'd say this PR partially addresses #7013. Could you please update the commit message and PR description.

Otherwise lgtm

Thanks for the review @QuanZhang-William . I left a comment at #7013 (comment) to show that after examining the issue there might not much other information that could be provided for the container status. And I totally agree that we could leave this judgement for the author of the issue. Updated.

[QuanZhang-William]

Thanks!

/lgtm