UT： refer metadata service

[CrazyHZM]

What is the purpose of the change

Brief changelog

Verifying this change

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.
• Each commit in the pull request should have a meaningful subject line and body.
• Write a pull request description that is detailed enough to understand what the pull request does, how, and why.
• 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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[codecov-commenter]

Codecov Report

Merging #8761 (a18d558) into 3.0 (b1ebfe8) will increase coverage by 0.12%.
The diff coverage is 85.71%.

@@             Coverage Diff              @@
##                3.0    #8761      +/-   ##
============================================
+ Coverage     63.63%   63.75%   +0.12%     
- Complexity      311      314       +3     
============================================
  Files          1149     1149              
  Lines         48283    48351      +68     
  Branches       7281     7292      +11     
============================================
+ Hits          30724    30826     +102     
+ Misses        14176    14152      -24     
+ Partials       3383     3373      -10     

Impacted Files	Coverage Δ
.../dubbo/registry/client/DefaultServiceInstance.java	84.74% <ø> (ø)
.../dubbo/registry/client/metadata/MetadataUtils.java	85.71% <75.00%> (+0.42%)	⬆️
...metadata/SpringCloudMetadataServiceURLBuilder.java	100.00% <100.00%> (ø)
...bbo/common/threadlocal/InternalThreadLocalMap.java	74.02% <0.00%> (-15.17%)	⬇️
...va/org/apache/dubbo/remoting/exchange/Request.java	77.19% <0.00%> (-11.05%)	⬇️
...in/java/org/apache/dubbo/rpc/model/ScopeModel.java	59.09% <0.00%> (-6.30%)	⬇️
.../dubbo/remoting/transport/netty4/NettyChannel.java	65.34% <0.00%> (-1.00%)	⬇️
...bo/rpc/cluster/support/FailbackClusterInvoker.java	53.12% <0.00%> (-0.85%)	⬇️
...dubbo/remoting/exchange/support/DefaultFuture.java	89.18% <0.00%> (-0.29%)	⬇️
...a/org/apache/dubbo/rpc/model/ApplicationModel.java	79.66% <0.00%> (-0.16%)	⬇️
... and 40 more

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