chore: delete dead code in test/per_feature_flags_test.go file

[zakisk]

Changes

test/per_feature_flags_test.go file has system namespace retrieve code from env and fallback to hardcoded value but that ns value is never used in code so deletes it.

Submitter Checklist

As the author of this PR, please check off the items in this checklist:

• Has Docs if any changes are user facing, including updates to minimum requirements e.g. Kubernetes version bumps
• Has Tests included if any functionality added or changed
• pre-commit Passed
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Release Notes

NOT REQUIRED

[zakisk]

/kind chore

[tekton-robot]

@zakisk: The label(s) kind/chore cannot be applied, because the repository doesn't have them.

Details

In response to this:

/kind chore

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[zakisk]

/kind cleanup

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.70%. Comparing base (538955f) to head (e03a67d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10802   +/-   ##
=======================================
  Coverage   90.70%   90.70%           
=======================================
  Files         295      295           
  Lines       22535    22535           
=======================================
  Hits        20440    20440           
  Misses       2093     2093           
  Partials        2        2           

Flag	Coverage Δ
unit-tests	90.70% <ø> (ø)

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[vdemeester]

/lgtm

[tekton-robot]

[APPROVALNOTIFIER] This PR is APPROVED

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