fix ClassCastException

[leyou240]

What is the purpose of the change?

When using tracing, all web controller will fail.
There is a demo project to describe the problem. https://github.com/leyou240/tracing-demo

java.lang.ClassCastException: class org.springframework.http.server.observation.ServerRequestObservationContext cannot be cast to class org.apache.dubbo.tracing.context.DubboServerContext (org.springframework.http.server.observation.ServerRequestObservationContext and org.apache.dubbo.tracing.context.DubboServerContext are in unnamed module of loader 'app')
	at org.apache.dubbo.tracing.handler.DubboServerTracingObservationHandler.onScopeOpened(DubboServerTracingObservationHandler.java:28) ~[dubbo-3.3.2.jar:3.3.2]
	at io.micrometer.observation.SimpleObservation.notifyOnScopeOpened(SimpleObservation.java:235) ~[micrometer-observation-1.14.1.jar:1.14.1]
	at io.micrometer.observation.SimpleObservation.openScope(SimpleObservation.java:194) ~[micrometer-observation-1.14.1.jar:1.14.1]
	at org.springframework.web.filter.ServerHttpObservationFilter.doFilterInternal(ServerHttpObservationFilter.java:112) ~[spring-web-6.2.0.jar:6.2.0]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.0.jar:6.2.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:201) ~[spring-web-6.2.0.jar:6.2.0]
	at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:116) ~[spring-web-6.2.0.jar:6.2.0]
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:164) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:140) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:483) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:344) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:397) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:905) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1741) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1190) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63) ~[tomcat-embed-core-10.1.33.jar:10.1.33]
	at java.base/java.lang.Thread.run(Thread.java:1583) ~[na:na]

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?

[leyou240]

@CrazyHZM @AlbumenJ

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.

Project coverage is 60.75%. Comparing base (92b1ac1) to head (91ac686).

Files with missing lines	Patch %	Lines
.../handler/DubboClientTracingObservationHandler.java	0.00%	1 Missing ⚠️
.../handler/DubboServerTracingObservationHandler.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #14966      +/-   ##
============================================
- Coverage     60.76%   60.75%   -0.01%     
- Complexity    10859    10861       +2     
============================================
  Files          1882     1882              
  Lines         85983    85983              
  Branches      12876    12876              
============================================
- Hits          52247    52239       -8     
- Misses        28292    28299       +7     
- Partials       5444     5445       +1     

Flag	Coverage Δ
integration-tests	32.99% <0.00%> (-0.01%)	⬇️
samples-tests	29.22% <0.00%> (+0.02%)	⬆️
unit-tests	58.90% <0.00%> (-0.02%)	⬇️

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