support <dubbo:annotation> element tag in xml when using legacy names…

[xiaoduanayu]

What is the purpose of the change

support dubbo:annotation element tag in xml when using legacy namespace.

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.
• Add some description to dubbo-website project if you are requesting to add a feature.
• GitHub Actions works fine on your own branch.
• If this contribution is large, please follow the Software Donation Guide.

[codecov-commenter]

Codecov Report

Merging #7995 (8fec07f) into master (744d302) will increase coverage by 0.36%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #7995      +/-   ##
============================================
+ Coverage     60.03%   60.39%   +0.36%     
+ Complexity      489      456      -33     
============================================
  Files          1089     1089              
  Lines         43876    43876              
  Branches       6413     6395      -18     
============================================
+ Hits          26340    26501     +161     
+ Misses        14576    14413     -163     
- Partials       2960     2962       +2     

Impacted Files	Coverage Δ
...e/dubbo/registry/consul/ConsulRegistryFactory.java	0.00% <0.00%> (-100.00%)	⬇️
...g/apache/dubbo/registry/consul/ConsulRegistry.java	0.00% <0.00%> (-60.00%)	⬇️
...ntext/event/AwaitingNonWebApplicationListener.java	46.96% <0.00%> (-25.76%)	⬇️
...g/apache/dubbo/remoting/p2p/support/FileGroup.java	41.50% <0.00%> (-22.65%)	⬇️
...nfig/configcenter/nop/NopDynamicConfiguration.java	62.50% <0.00%> (-12.50%)	⬇️
...che/dubbo/remoting/transport/mina/MinaChannel.java	35.52% <0.00%> (-10.53%)	⬇️
...o/remoting/transport/ChannelHandlerDispatcher.java	60.00% <0.00%> (-10.00%)	⬇️
.../threadpool/manager/DefaultExecutorRepository.java	80.95% <0.00%> (-4.77%)	⬇️
...mmon/serialize/kryo/utils/AbstractKryoFactory.java	75.43% <0.00%> (-3.51%)	⬇️
.../org/apache/dubbo/qos/legacy/LogTelnetHandler.java	30.30% <0.00%> (-3.04%)	⬇️
... and 56 more

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