chore: remove #3393 todo

[czeslavo]

What this PR does / why we need it:

As the admission webhook itself is already tested in many aspects in integration tests, we prefer to remove this check completely from the E2Es.

Which issue this PR fixes:

Closes #3393.

[codecov]

Codecov Report

Base: 73.9% // Head: 74.0% // Increases project coverage by +0.0% 🎉

Coverage data is based on head (8e67b88) compared to base (bf32874).
Patch has no changes to coverable lines.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #3403   +/-   ##
=====================================
  Coverage   73.9%   74.0%           
=====================================
  Files        113     113           
  Lines      13896   13896           
=====================================
+ Hits       10282   10287    +5     
+ Misses      2963    2960    -3     
+ Partials     651     649    -2     

Impacted Files	Coverage Δ
internal/dataplane/parser/parser.go	90.4% <0.0%> (-1.7%)	⬇️
...ternal/controllers/gateway/httproute_controller.go	58.3% <0.0%> (+1.1%)	⬆️
...nternal/controllers/gateway/tcproute_controller.go	72.0% <0.0%> (+2.0%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.