fix: end-to-end.yaml

[wrzasa]

Added missing namespace fixed invalid reference to FeatureFlag in FeatureFlagSource.

This PR

Fixes bugs in the sample end-to-end K8S manifest

Related Issues

N/A

Notes

N/A

Follow-up Tasks

N/A

How to test

kubectl apply -f end-to-end.yaml now results in successful deployment.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 71.55%. Comparing base (499661e) to head (a90f218).
Report is 66 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #771       +/-   ##
===========================================
- Coverage   86.51%   71.55%   -14.97%     
===========================================
  Files          19       30       +11     
  Lines        1587     2299      +712     
===========================================
+ Hits         1373     1645      +272     
- Misses        173      606      +433     
- Partials       41       48        +7     

see 11 files with indirect coverage changes

Flag	Coverage Δ
unit-tests	71.55% <ø> (∅)

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