Change constant name of error code 0-2, merge 4-19 to 0-2. Add error code of 'port is overridden' hint.

[win120a]

What is the purpose of the change

Add missing error code.

Brief changelog

1. Add error code of 'port is overridden' hint.
2. Since 4-19 is same as 0-2, this PR merged original code 4-19 to code 0-2.

[sonarqubecloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

20.0% Coverage
0.0% Duplication

[codecov-commenter]

Codecov Report

Merging #11181 (18742f0) into 3.1 (0b2a8f0) will decrease coverage by 4.63%.
The diff coverage is 30.00%.

@@             Coverage Diff              @@
##                3.1   #11181      +/-   ##
============================================
- Coverage     69.29%   64.66%   -4.64%     
+ Complexity      127       14     -113     
============================================
  Files          1502     1421      -81     
  Lines         78949    59304   -19645     
  Branches      13842     8720    -5122     
============================================
- Hits          54711    38346   -16365     
+ Misses        19484    16920    -2564     
+ Partials       4754     4038     -716     

Impacted Files	Coverage Δ
...t/migration/DefaultMigrationAddressComparator.java	79.54% <0.00%> (-2.28%)	⬇️
...gistry/client/migration/MigrationRuleListener.java	66.94% <0.00%> (-6.00%)	⬇️
...bo/registry/support/CacheableFailbackRegistry.java	78.82% <0.00%> (-7.69%)	⬇️
...dubbo/rpc/protocol/dubbo/CallbackServiceCodec.java	82.46% <0.00%> (-4.92%)	⬇️
...he/dubbo/config/context/AbstractConfigManager.java	78.57% <50.00%> (-2.52%)	⬇️
.../org/apache/dubbo/common/config/Configuration.java	78.43% <100.00%> (-1.06%)	⬇️
...ient/metadata/ProtocolPortsMetadataCustomizer.java	88.88% <100.00%> (-1.12%)	⬇️
...luster/router/script/ScriptStateRouterFactory.java	0.00% <0.00%> (-100.00%)	⬇️
...he/dubbo/test/common/impl/GreetingServiceImpl.java	0.00% <0.00%> (-100.00%)	⬇️
...zookeeper/curator/CuratorZookeeperTransporter.java	0.00% <0.00%> (-100.00%)	⬇️
... and 497 more

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[AlbumenJ]

LGTM