[3.0] Ensure generated config id is unique, checking existed config

[kylixs]

What is the purpose of the change

Ensure generated config id is unique, checking existed config.

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 #8322 (6a88b7b) into 3.0 (9cb97e3) will decrease coverage by 0.38%.
The diff coverage is 67.85%.

@@             Coverage Diff              @@
##                3.0    #8322      +/-   ##
============================================
- Coverage     63.95%   63.57%   -0.39%     
+ Complexity      313      312       -1     
============================================
  Files          1078     1099      +21     
  Lines         45744    46054     +310     
  Branches       6864     6952      +88     
============================================
+ Hits          29255    29277      +22     
- Misses        13233    13506     +273     
- Partials       3256     3271      +15     

Impacted Files	Coverage Δ
...org/apache/dubbo/config/context/ConfigManager.java	75.67% <60.00%> (-0.36%)	⬇️
.../apache/dubbo/config/bootstrap/DubboBootstrap.java	69.48% <72.22%> (-0.31%)	⬇️
.../apache/dubbo/remoting/transport/AbstractPeer.java	60.86% <0.00%> (-4.35%)	⬇️
...he/dubbo/remoting/transport/netty/NettyServer.java	70.17% <0.00%> (-3.51%)	⬇️
...org/apache/dubbo/rpc/protocol/AbstractInvoker.java	68.46% <0.00%> (-2.71%)	⬇️
...ry/client/metadata/MetadataServiceNameMapping.java	73.68% <0.00%> (-2.68%)	⬇️
...stry/client/ServiceDiscoveryRegistryDirectory.java	47.36% <0.00%> (-1.90%)	⬇️
.../exchange/support/header/HeaderExchangeServer.java	66.98% <0.00%> (-1.89%)	⬇️
...ava/org/apache/dubbo/common/utils/ConfigUtils.java	69.51% <0.00%> (-0.61%)	⬇️
...g/apache/dubbo/config/AbstractInterfaceConfig.java	86.75% <0.00%> (-0.52%)	⬇️
... and 39 more

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