fix: do not send target_executor to Executors

[JoanFM]

Goals:

Fix problem trying to connect to CaS as External Executor with target_executor parameter.

Since it is a Gateway-Gateway communication, you are actually passing the target_executor also to the second gateway, and in the external Flow, the executor may not be called the same and then it does not match any and returns the Docs unchanged.
The fix is to remove target_executor from the request once it is extracte

[codecov]

Codecov Report

Merging #5041 (75c0ecd) into master (032bd5e) will decrease coverage by 0.10%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #5041      +/-   ##
==========================================
- Coverage   88.10%   87.99%   -0.11%     
==========================================
  Files         114      114              
  Lines        9031     9033       +2     
==========================================
- Hits         7957     7949       -8     
- Misses       1074     1084      +10     

Flag	Coverage Δ
jina	87.99% <100.00%> (-0.05%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
jina/__init__.py	64.63% <100.00%> (ø)
jina/serve/runtimes/gateway/request_handling.py	95.86% <100.00%> (+0.06%)	⬆️
jina/serve/runtimes/gateway/websocket/__init__.py	97.87% <0.00%> (-2.13%)	⬇️
...a/orchestrate/deployments/config/docker_compose.py	99.00% <0.00%> (-1.00%)	⬇️
jina/hubble/hubio.py	86.29% <0.00%> (-0.81%)	⬇️
jina/orchestrate/flow/base.py	89.88% <0.00%> (-0.57%)	⬇️

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[samsja]

lgtm