Remove useless code in InjvmProtocolTest

[xiaoheng1]

What is the purpose of the change

Remove useless code in InjvmProtocolTest

see more detail from #7854

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 #7855 (660c550) into master (028153a) will decrease coverage by 0.35%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##             master    #7855      +/-   ##
============================================
- Coverage     59.46%   59.11%   -0.36%     
  Complexity      555      555              
============================================
  Files          1086     1088       +2     
  Lines         43844    43854      +10     
  Branches       6399     6382      -17     
============================================
- Hits          26074    25926     -148     
- Misses        14885    15044     +159     
+ Partials       2885     2884       -1     

Impacted Files	Coverage Δ
...a/org/apache/dubbo/rpc/filter/AccessLogFilter.java	28.35% <0.00%> (-50.75%)	⬇️
...va/org/apache/dubbo/rpc/support/AccessLogData.java	53.16% <0.00%> (-37.98%)	⬇️
...dubbo/common/status/support/LoadStatusChecker.java	46.15% <0.00%> (-15.39%)	⬇️
...rg/apache/dubbo/remoting/utils/PayloadDropper.java	76.92% <0.00%> (-15.39%)	⬇️
...ng/transport/dispatcher/WrappedChannelHandler.java	43.47% <0.00%> (-15.22%)	⬇️
...ng/transport/dispatcher/all/AllChannelHandler.java	68.96% <0.00%> (-13.80%)	⬇️
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	81.13% <0.00%> (-11.33%)	⬇️
...che/dubbo/remoting/transport/mina/MinaChannel.java	35.52% <0.00%> (-10.53%)	⬇️
...g/apache/dubbo/remoting/p2p/support/FileGroup.java	41.50% <0.00%> (-9.44%)	⬇️
...ting/exchange/support/header/HeartbeatHandler.java	83.72% <0.00%> (-9.31%)	⬇️
... and 22 more

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