fix: resolved resource leaks in ConfigUtils

[yogiwaran2003]

…n ConfigUtils

What is the purpose of the change?

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

❌ Patch coverage is 60.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.78%. Comparing base (06334a5) to head (bfe048f).

Files with missing lines	Patch %	Lines
...ava/org/apache/dubbo/common/utils/ConfigUtils.java	60.00%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #16111      +/-   ##
============================================
- Coverage     60.80%   60.78%   -0.02%     
  Complexity    11750    11750              
============================================
  Files          1953     1953              
  Lines         89121    89119       -2     
  Branches      13443    13444       +1     
============================================
- Hits          54192    54175      -17     
- Misses        29369    29377       +8     
- Partials       5560     5567       +7     

Flag	Coverage Δ
integration-tests-java21	32.17% <0.00%> (+<0.01%)	⬆️
integration-tests-java8	32.20% <0.00%> (-0.05%)	⬇️
samples-tests-java21	32.16% <0.00%> (-0.02%)	⬇️
samples-tests-java8	29.75% <0.00%> (+<0.01%)	⬆️
unit-tests-java11	59.05% <60.00%> (-0.02%)	⬇️
unit-tests-java17	58.55% <60.00%> (-0.02%)	⬇️
unit-tests-java21	58.54% <60.00%> (-0.02%)	⬇️
unit-tests-java25	58.51% <60.00%> (-0.01%)	⬇️
unit-tests-java8	59.07% <60.00%> (-0.01%)	⬇️

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[yogiwaran2003]

fixed the issue except the stringbuilder issue