Use gRPC buffer pool for GET EC requests

[cthulhu-rider]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 31 lines in your changes missing coverage. Please review.
✅ Project coverage is 30.29%. Comparing base (c34cedd) to head (6916f13).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
pkg/services/object/get.go	0.00%	26 Missing ⚠️
pkg/services/object/search.go	0.00%	3 Missing ⚠️
pkg/services/object/get/ec.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4158      +/-   ##
==========================================
- Coverage   30.30%   30.29%   -0.02%     
==========================================
  Files         673      673              
  Lines       40610    40627      +17     
==========================================
+ Hits        12307    12308       +1     
- Misses      28303    28319      +16     

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