[release-1.16] Remove northeurope from random region selection to be used for perf tests

[k8s-infra-cherrypick-robot]

This is an automated cherry-pick of #5358

/assign jackfrancis

NONE

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.33%. Comparing base (b3f60a4) to head (ae65119).
Report is 3 commits behind head on release-1.16.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-1.16    #5359   +/-   ##
=============================================
  Coverage         52.33%   52.33%           
=============================================
  Files               273      273           
  Lines             29156    29156           
=============================================
  Hits              15259    15259           
  Misses            13093    13093           
  Partials            804      804           

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