Remove envoy stats hostport from example manifests

[tsaarni]

This PR removes the Envoy stats (metrics) hostPort 8002 from the example deployment manifests in examples. Exposing metrics in host networking is not recommended for general deployments, so the examples should not include it.

Since the e2e test suite uses these manifests but still requires port access for stats, this PR also updates the suite to expose the port programmatically.

Fixes #7475

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.84%. Comparing base (23ba0a6) to head (bd29c0c).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7476   +/-   ##
=======================================
  Coverage   81.84%   81.84%           
=======================================
  Files         130      130           
  Lines       15722    15722           
=======================================
  Hits        12868    12868           
  Misses       2571     2571           
  Partials      283      283           

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