Remove duplicated invokers in registry notification

[AlbumenJ]

What is the purpose of the change?

Duplicated invokers will be created but ignored because we use map to store them

Thus, this will cause invoker nerver being destroyed

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

Attention: Patch coverage is 66.66667% with 4 lines in your changes missing coverage. Please review.

Project coverage is 41.38%. Comparing base (fc5f066) to head (6a97d93).
Report is 3 commits behind head on 3.2.

Files with missing lines	Patch %	Lines
.../dubbo/registry/integration/RegistryDirectory.java	33.33%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                3.2   #15060      +/-   ##
============================================
- Coverage     41.39%   41.38%   -0.01%     
+ Complexity    10511    10510       -1     
============================================
  Files          1652     1652              
  Lines         71449    71461      +12     
  Branches      10161    10163       +2     
============================================
- Hits          29574    29573       -1     
- Misses        37735    37744       +9     
- Partials       4140     4144       +4     

Flag	Coverage Δ
integration-tests	38.32% <66.66%> (-0.18%)	⬇️
samples-tests	36.36% <66.66%> (+0.10%)	⬆️

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