server: remove code to suppress duplicate writing of status

[easwars]

Follow-up from #9309.

The transport currently handles duplicate status write suppression. There is no need to add a further check in the gRPC layer without having an explicit reason for it. Maybe there is some edge case that requires it. So, removing it.

RELEASE NOTES: none

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 83.09%. Comparing base (bf9e7cd) to head (e944480).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #9322      +/-   ##
==========================================
+ Coverage   83.07%   83.09%   +0.02%     
==========================================
  Files         423      423              
  Lines       35230    35226       -4     
==========================================
+ Hits        29266    29272       +6     
+ Misses       4448     4444       -4     
+ Partials     1516     1510       -6     

Files with missing lines	Coverage Δ
server.go	83.55% <100.00%> (+0.11%)	⬆️
stream.go	84.16% <100.00%> (+0.37%)	⬆️

... and 24 files with indirect coverage changes

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