Add missing v1alpha2 Workflow states

[chrisdoherty4]

This adds the missing states outlined in https://github.com/tinkerbell/roadmap/blob/main/design/230728_tinkerbell_workflow_execution.md to the v1alpha2 API.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7f417ed) 51.16% compared to head (0730e71) 51.16%.

❗ Current head 0730e71 differs from pull request most recent head e48a325. Consider uploading reports for the commit e48a325 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #838   +/-   ##
=======================================
  Coverage   51.16%   51.16%           
=======================================
  Files          33       33           
  Lines        1456     1456           
=======================================
  Hits          745      745           
  Misses        665      665           
  Partials       46       46           

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