test: deflake RateLimitGlobalMergeTest/shared_no_client_selectors

[mmmommm]

What this PR does / why we need it:

fix the flaky ratelimit e2e test.
ran the e2e test 50 times in the local kind cluster and all passed.

$ make create-cluster
$ kubectl config current-context
$ make kube-install-image
$ make kube-deploy
$ make install-ratelimit
$ make kube-install-examples-image
$ make e2e-prepare
$ make setup-mac-net-connect
$ fails=0
 for i in $(seq 1 50); do
 kubectl exec -n redis-system deploy/redis -- redis-cli FLUSHALL >/dev/null
 if go test -tags e2e -timeout 20m -run TestE2E ./e2e --gateway-class=envoy-gateway --cleanup-base-resources=false --run-test RateLimitGlobalMergeTest >"$TMPDIR/rl_run_$i.log" 2>&1; then
 echo "run $i: PASS"
 else
 echo "run $i: FAIL -> $TMPDIR/rl_run_$i.log"
 fails=$((fails+1))
 fi
 done
 echo "TOTAL FAILURES: $fails / 50"
run 1: PASS
run 2: PASS
run 3: PASS
run 4: PASS
run 5: PASS
run 6: PASS
run 7: PASS
run 8: PASS
run 9: PASS
run 10: PASS
E0707 10:29:46.185755   30011 websocket.go:296] Unknown stream id 1, discarding message
run 11: PASS
run 12: PASS
run 13: PASS
run 14: PASS
run 15: PASS
run 16: PASS
run 17: PASS
run 18: PASS
run 19: PASS
run 20: PASS
run 21: PASS
run 22: PASS
run 23: PASS
run 24: PASS
run 25: PASS
run 26: PASS
run 27: PASS
run 28: PASS
E0707 10:34:06.671796   50172 websocket.go:296] Unknown stream id 1, discarding message
run 29: PASS
run 30: PASS
run 31: PASS
run 32: PASS
run 33: PASS
run 34: PASS
run 35: PASS
run 36: PASS
run 37: PASS
run 38: PASS
run 39: PASS
run 40: PASS
run 41: PASS
run 42: PASS
run 43: PASS
run 44: PASS
run 45: PASS
run 46: PASS
run 47: PASS
run 48: PASS
run 49: PASS
run 50: PASS
TOTAL FAILURES: 0 / 50

Which issue(s) this PR fixes:

Fixes #8113

---

PR Checklist

• Authorship & ownership: Coding agents / AI assistants are welcome, but I have reviewed every change, understand how and why it works, can explain and maintain it, and take full responsibility for this PR. I have not submitted generated output I do not understand.
• DCO: All commits are signed off (git commit -s). See DCO: Sign your work.
• API agreed first: If this PR contains API changes (changes under /api), the API was discussed and agreed before the implementation. The API change can be in a separate PR, or in the same PR, but the API must be agreed before implementation. N/A if this PR does not contain API changes.
• Required checks pass: make generate gen-check, make lint, and the unit-test/coverage build pass. (Flaky e2e failures are not considered breakages, but gen-check, lint, and coverage MUST pass.)
• Tests added/updated: New/changed code is covered by appropriate tests. N/A if this PR does not contain code changes.
• Docs: User-facing changes update the docs, either in this PR or a follow-up PR. N/A if this PR does not contain user-facing changes.
• Release notes: For any non-trivial change, added a release-note fragment under release-notes/current/<section>/<pr-number>-<slug>.md (see release-notes/current/README.md for sections and naming). N/A if this PR does not contain non-trivial changes.
• Generated files committed: Ran make gen-check and committed the result if API/helm charts/modules changed.
• Scope & compatibility: The PR is reasonably scoped (no unrelated changes) and preserves backward compatibility, or any breaking change is called out above and documented in release-notes/current/breaking_changes/.
• Codex review: Requested a Codex review and addressed all of its comments.
• Copilot review: Requested a Copilot review and addressed all of its comments.

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[mmmommm]

The root cause was that the test hard-coded the exact request at which a 429 is expected (send N, then assert the next is 429).
The fix send requests until a 429 is actually observed instead of pinning the count. I also added per-request logging so a timeout stays diagnosable now that we no longer check an exact count.

[mmmommm]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Already looking forward to the next diff.

Reviewed commit: 34a84022e8

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 75.45%. Comparing base (c9e6a44) to head (8eb766e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9427      +/-   ##
==========================================
+ Coverage   75.41%   75.45%   +0.04%     
==========================================
  Files         252      252              
  Lines       41660    41660              
==========================================
+ Hits        31416    31435      +19     
+ Misses       8115     8098      -17     
+ Partials     2129     2127       -2     

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