Fix order dependent tests in InternalThreadLocalTest

[SaaiVenkat]

What is the purpose of the change

• In dubbo-common, several test cases in the test class dubbo-common,org.apache.dubbo.common.threadlocal.InternalThreadLocalTest.java can trigger java.lang.ClassCastException, when being run after the unit test in testConstructionWithIndex() in the same class because it pollutes state shared among tests.
• It may be good to clean this state pollution so that some other tests do not fail in the future due to the shared state polluted by this test.

Issue Link: DUBBO-13359

Brief changelog

• Changed nextIndex.get() to nextIndex.incrementAndGet() in InternalThreadLocalTest.java to properly restore the polluted state InternalThreadLocalMap.NEXT_INDEX

Verifying this change

• With the proposed fix, the test does not pollute the shared state.
• All the tests pass when run in the any order.

Checklist

• Make sure there is a GitHub_issue field for the change (usually before you start working on it). Trivial changes like typos do not require a GitHub issue. Your pull request should address just this issue, without pulling in other changes - one PR resolves one issue.
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• Check if is necessary to patch to Dubbo 3 if you are work on Dubbo 2.7
• Write necessary unit-test to verify your logic correction, more mock a little better when cross module dependency exist. If the new feature or significant change is committed, please remember to add sample in dubbo samples project.
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[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (7c3e592) 69.56% compared to head (cca16af) 69.55%.

Additional details and impacted files

@@             Coverage Diff              @@
##                3.2   #13361      +/-   ##
============================================
- Coverage     69.56%   69.55%   -0.02%     
  Complexity        2        2              
============================================
  Files          1652     1652              
  Lines         71608    71608              
  Branches      10264    10264              
============================================
- Hits          49813    49804       -9     
  Misses        17102    17102              
- Partials       4693     4702       +9     

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