fix: keep stale addresses refreshed on metadata failure (#16375)

[Anon2Tokyo]

What is the purpose of the change?
Fixes #16375

Fix stale provider addresses not being cleared when metadata lookup fails for all revisions in ServiceInstancesChangedListener. The listener now continues through address notification so a later refresh can evict outdated URLs instead of keeping old Pod IPs around.

Checklist

• Make sure there is a GitHub_issue field for the change.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• Write necessary unit-test to verify your logic correction. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
• Make sure gitHub actions can pass. Why the workflow is failing and how to fix it?

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 60.32%. Comparing base (3a30432) to head (3c91d8b).

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #16423      +/-   ##
============================================
- Coverage     60.87%   60.32%   -0.56%     
+ Complexity    11766    10261    -1505     
============================================
  Files          1953     1953              
  Lines         89273    89252      -21     
  Branches      13473    13389      -84     
============================================
- Hits          54346    53837     -509     
- Misses        29333    29737     +404     
- Partials       5594     5678      +84     

Flag	Coverage Δ
integration-tests-java21	?
integration-tests-java8	?
samples-tests-java21	32.16% <ø> (-0.04%)	⬇️
samples-tests-java8	29.83% <ø> (+0.03%)	⬆️
unit-tests-java11	?
unit-tests-java17	58.59% <ø> (-0.05%)	⬇️
unit-tests-java21	58.59% <ø> (-0.02%)	⬇️
unit-tests-java25	?
unit-tests-java8	?

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