Clean up resources created by Feature tests

[vaikas]

Fixes #

Proposed Changes

• 🎁 Delete k8s resources created in Features. Important for some environments where we create many resources and the footprint may not be light.
• Utilizes add feature to context, add refs to feature knative-extensions/reconciler-test#183

Release Note

Docs

[codecov]

Codecov Report

Merging #5289 (7ee4218) into main (73ce225) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #5289   +/-   ##
=======================================
  Coverage   83.61%   83.61%           
=======================================
  Files         243      243           
  Lines        6896     6896           
=======================================
  Hits         5766     5766           
  Misses        786      786           
  Partials      344      344           

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[n3wscott]

/lgtm
/approve

[knative-prow-robot]

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[n3wscott]

/lgtm