Create a separate Enum for pod_result status

[Synicix]

Currently the code uses the same status for pod_run and pod result. This leads to a problem where certain conditions such as Running and Unset should never be in pod_result, forcing users to match against those invalid cases.

[Synicix]

After discussion with @guzman-raphael we decided to go with PodStatus and PipelineStatus as two separate concern. Currently handle by PR #111

[Synicix]

Correction, it is already been merged by a previous PR