RpcInvocation adds returnType assignment in initParameterDesc

[xiaoheng1]

What is the purpose of the change

RpcInvocation adds returnType assignment in initParameterDesc

see more detail from #7745

Brief changelog

Verifying this change

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[BurningCN]

Can this line be deleted?

[xiaoheng1]

Can this line be deleted?

greet! i think this line can be deleted.

[codecov-commenter]

Codecov Report

Merging #7746 (793eca5) into master (e845e16) will decrease coverage by 0.12%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master    #7746      +/-   ##
============================================
- Coverage     59.28%   59.15%   -0.13%     
  Complexity      529      529              
============================================
  Files          1077     1080       +3     
  Lines         43565    43651      +86     
  Branches       6368     6372       +4     
============================================
- Hits          25826    25823       -3     
- Misses        14879    14973      +94     
+ Partials       2860     2855       -5     

Impacted Files	Coverage Δ	Complexity Δ
.../main/java/org/apache/dubbo/rpc/RpcInvocation.java	64.73% <100.00%> (+0.20%)	0.00 <0.00> (ø)
...ntext/event/AwaitingNonWebApplicationListener.java	48.48% <0.00%> (-24.25%)	0.00% <0.00%> (ø%)
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	86.79% <0.00%> (-5.67%)	0.00% <0.00%> (ø%)
...dubbo/remoting/exchange/support/DefaultFuture.java	82.05% <0.00%> (-5.13%)	0.00% <0.00%> (ø%)
.../dubbo/monitor/support/AbstractMonitorFactory.java	78.37% <0.00%> (-2.71%)	0.00% <0.00%> (ø%)
...org/apache/dubbo/registry/redis/RedisRegistry.java	48.61% <0.00%> (-0.40%)	26.00% <0.00%> (-1.00%)
...in/java/org/apache/dubbo/config/ServiceConfig.java	62.71% <0.00%> (-0.36%)	0.00% <0.00%> (ø%)
.../apache/dubbo/remoting/transport/AbstractPeer.java	63.04% <0.00%> (ø)	0.00% <0.00%> (ø%)
...che/dubbo/registry/nacos/NacosRegistryFactory.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
...o/registry/nacos/util/NacosNamingServiceUtils.java	0.00% <0.00%> (ø)	0.00% <0.00%> (ø%)
... and 20 more

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