Fix Skipped pipelinerun status

Description of problem:

If When expression or conditions are used in a pipeline, then all the skipped tasks status are shown incorrectly.

Prerequisites (if any, like setup, operators/versions):

Install openshift pipelines operator

Steps to Reproduce

1. create a pipeline with when expression
   https://github.com/tektoncd/pipeline/blob/main/examples/v1beta1/pipelineruns/using-optional-workspaces-in-when-expressions.yaml

Actual results:  

Skipped tasks has the pending task state on the task pill

Expected results:

Skipped tasks should have skipped state.

Reproducibility (Always/Intermittent/Only Once):

Always