[Dubbo3-Triple] Remove rpc context to avoid http2 headers override

[guohao]

What is the purpose of the change

Fix overrided RPCContext persudo headers that causes request failure

Brief changelog

XXXXX

Verifying this change

XXXXX

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[codecov-io]

Codecov Report

Merging #7345 (6e7554f) into 3.0 (8c24a48) will decrease coverage by 0.25%.
The diff coverage is 0.00%.

@@             Coverage Diff              @@
##                3.0    #7345      +/-   ##
============================================
- Coverage     57.46%   57.21%   -0.26%     
+ Complexity      357      356       -1     
============================================
  Files           983      983              
  Lines         40137    40155      +18     
  Branches       5996     5978      -18     
============================================
- Hits          23066    22974      -92     
- Misses        14363    14445      +82     
- Partials       2708     2736      +28     

Impacted Files	Coverage Δ	Complexity Δ
.../apache/dubbo/rpc/protocol/tri/AbstractStream.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...rg/apache/dubbo/rpc/protocol/tri/ServerStream.java	0.00% <0.00%> (ø)	0.00 <0.00> (ø)
...rg/apache/dubbo/remoting/utils/PayloadDropper.java	15.38% <0.00%> (-30.77%)	0.00% <0.00%> (ø%)
...ng/transport/dispatcher/all/AllChannelHandler.java	62.06% <0.00%> (-20.69%)	0.00% <0.00%> (ø%)
...dubbo/common/status/support/LoadStatusChecker.java	46.15% <0.00%> (-15.39%)	0.00% <0.00%> (ø%)
...ng/transport/dispatcher/WrappedChannelHandler.java	47.82% <0.00%> (-15.22%)	0.00% <0.00%> (ø%)
...mmon/threadpool/support/AbortPolicyWithReport.java	85.00% <0.00%> (-12.50%)	0.00% <0.00%> (ø%)
...dubbo/remoting/exchange/support/DefaultFuture.java	73.50% <0.00%> (-11.97%)	0.00% <0.00%> (ø%)
...in/java/org/apache/dubbo/common/utils/JVMUtil.java	81.13% <0.00%> (-11.33%)	0.00% <0.00%> (ø%)
...va/org/apache/dubbo/remoting/TimeoutException.java	22.22% <0.00%> (-11.12%)	0.00% <0.00%> (ø%)
... and 29 more

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