fix: add retry to consistent hash e2e

[jukie]

Flaky e2e - https://github.com/envoyproxy/gateway/actions/runs/22377392011/job/64771812796?pr=8173

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.73%. Comparing base (26fa4e6) to head (1876970).
⚠️ Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #8337   +/-   ##
=======================================
  Coverage   73.73%   73.73%           
=======================================
  Files         241      241           
  Lines       37077    37077           
=======================================
  Hits        27337    27337           
  Misses       7796     7796           
  Partials     1944     1944           

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[jukie]

This doesn't seem like the full/right fix