remove strong dep micrometer in tracing

[songxiaosheng]

What is the purpose of the change?

remove strong dep micrometer in tracing
fix pr: #14872

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?

[AlbumenJ]

Please fix style check

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 13 lines in your changes missing coverage. Please review.

Project coverage is 60.75%. Comparing base (c23e951) to head (4bc762c).

Files with missing lines	Patch %	Lines
...apache/dubbo/tracing/DubboObservationRegistry.java	0.00%	8 Missing ⚠️
...apache/dubbo/tracing/metrics/ObservationMeter.java	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##                3.3   #14986   +/-   ##
=========================================
  Coverage     60.74%   60.75%           
+ Complexity    10863    10860    -3     
=========================================
  Files          1882     1883    +1     
  Lines         86009    86009           
  Branches      12886    12886           
=========================================
+ Hits          52249    52255    +6     
+ Misses        28316    28312    -4     
+ Partials       5444     5442    -2     

Flag	Coverage Δ
integration-tests	33.00% <0.00%> (-0.06%)	⬇️
samples-tests	29.08% <0.00%> (-0.02%)	⬇️
unit-tests	58.89% <0.00%> (-0.01%)	⬇️

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[songxiaosheng]

Please fix style check

fixed