Bugfix: An instance of the subclass of RegistryConfig should be added to configsCache as the RegistryConfig class type #15016

[youjie23]

What is the purpose of the change?

Fix #15016
An instance of the subclass of RegistryConfig should be added to configsCache as the RegistryConfig class type

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 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 60.76%. Comparing base (a9e4910) to head (6ac903a).

Files with missing lines	Patch %	Lines
...he/dubbo/config/context/AbstractConfigManager.java	85.71%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #15017      +/-   ##
============================================
- Coverage     60.76%   60.76%   -0.01%     
- Complexity    10866    10873       +7     
============================================
  Files          1882     1882              
  Lines         85983    85985       +2     
  Branches      12876    12876              
============================================
+ Hits          52246    52247       +1     
- Misses        28289    28291       +2     
+ Partials       5448     5447       -1     

Flag	Coverage Δ
integration-tests	33.03% <57.14%> (-0.11%)	⬇️
samples-tests	29.09% <57.14%> (-0.14%)	⬇️
unit-tests	58.91% <85.71%> (+<0.01%)	⬆️

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