fix: removed the duplicate CallbackAdapter.java file

[cutePanda123]

Fix: remove duplicate CallbackAdapter file #6457

• Add a unit test to verify that the fix works.
• Explain briefly why the bug exists and how to fix it.
  What I did: remove the duplicate CallbackAdapter.java file

• If this pull request closes/resolves/fixes an existing issue, replace the issue number. Closes Why are there two copies of CallbackAdapter.java? #6457.
• Update the CHANGES log.

[codecov]

Codecov Report

Merging #6458 (c45c084) into master (3a6c39c) will decrease coverage by 8.21%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #6458      +/-   ##
============================================
- Coverage     53.70%   45.48%   -8.22%     
+ Complexity     4085     2691    -1394     
============================================
  Files          1790     1792       +2     
  Lines         38273    38292      +19     
  Branches       4228     4198      -30     
============================================
- Hits          20554    17419    -3135     
- Misses        16716    19875    +3159     
+ Partials       1003      998       -5     

Impacted Files	Coverage Δ	Complexity Δ
...skywalking/oap/server/core/alarm/AlarmMessage.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...ywalking/apm/agent/core/plugin/EnhanceContext.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-5.00%)
...walking/apm/agent/core/plugin/match/NameMatch.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-3.00%)
...ng/oap/server/core/analysis/config/NoneStream.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
.../apm/agent/core/context/ids/PropagatedTraceId.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...lking/oap/server/analyzer/event/EventAnalyzer.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-6.00%)
...rver/core/browser/source/BrowserErrorCategory.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-8.00%)
...core/browser/source/BrowserAppTrafficCategory.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
...ore/analysis/metrics/expression/NotEqualMatch.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-3.00%)
...log/analyzer/provider/log/ILogAnalyzerService.java	0.00% <0.00%> (-100.00%)	0.00% <0.00%> (-1.00%)
... and 296 more

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