[Dubbo-Nacos-NamingService] fix dubbo create nacos multiple identical NamingService

[minute5]

What is the purpose of the change

fix dubbo create nacos multiple identical NamingService

more detail: in issue #6988
#6988

Brief changelog

1. change NacosRegistryFactory createRegistryCacheKey method
2. remove the timestamp from url as registry cache key

Verifying this change

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[codecov-io]

Codecov Report

Merging #6990 (a6ad138) into master (3fc2d10) will decrease coverage by 0.08%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##             master    #6990      +/-   ##
============================================
- Coverage     59.44%   59.36%   -0.09%     
+ Complexity      511      507       -4     
============================================
  Files          1028     1028              
  Lines         41519    41523       +4     
  Branches       6037     6038       +1     
============================================
- Hits          24681    24650      -31     
- Misses        14102    14130      +28     
- Partials       2736     2743       +7     

Impacted Files	Coverage Δ	Complexity Δ
...che/dubbo/registry/nacos/NacosRegistryFactory.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...e/dubbo/remoting/transport/netty/NettyChannel.java	52.27% <0.00%> (-7.96%)	19.00% <0.00%> (-2.00%)
...ng/transport/dispatcher/all/AllChannelHandler.java	89.65% <0.00%> (-6.90%)	0.00% <0.00%> (ø%)
...mmon/serialize/kryo/utils/AbstractKryoFactory.java	75.43% <0.00%> (-3.51%)	0.00% <0.00%> (ø%)
...pache/dubbo/registry/support/AbstractRegistry.java	77.77% <0.00%> (-3.34%)	0.00% <0.00%> (ø%)
...g/apache/dubbo/rpc/protocol/rest/RestProtocol.java	68.21% <0.00%> (-3.11%)	0.00% <0.00%> (ø%)
...g/apache/dubbo/config/AbstractInterfaceConfig.java	85.18% <0.00%> (-2.47%)	0.00% <0.00%> (ø%)
...he/dubbo/rpc/protocol/hessian/HessianProtocol.java	67.46% <0.00%> (-2.41%)	9.00% <0.00%> (ø%)
...ache/dubbo/cache/support/expiring/ExpiringMap.java	40.35% <0.00%> (-1.76%)	0.00% <0.00%> (ø%)
...che/dubbo/remoting/transport/mina/MinaChannel.java	50.00% <0.00%> (-1.32%)	16.00% <0.00%> (-1.00%)
... and 11 more

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