🐛 Reset KUBERNETES env variables to ensure there's no Kube connection for unit test

[cardil]

Changes

• 🐛 Reset KUBERNETES env variables to ensure there's no Kube connection for unit test

/kind bug

Fixes #378

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 66.52%. Comparing base (a6872a8) to head (2206804).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #379   +/-   ##
=======================================
  Coverage   66.52%   66.52%           
=======================================
  Files          48       48           
  Lines        1440     1440           
=======================================
  Hits          958      958           
  Misses        412      412           
  Partials       70       70           

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[dsimansk]

/approve
/lgtm

[knative-prow]

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