[grpc-storage] Use grpc.NewClient

[yurishkuro]

Which problem is this PR solving?

• Part of Migrate from grpc.Dial to grpc.NewClient #5330

Description of the changes

• use grpc.NewClient
• add extra test

How was this change tested?

• CI

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.59%. Comparing base (4dc7708) to head (92eb519).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5393      +/-   ##
==========================================
- Coverage   94.60%   94.59%   -0.02%     
==========================================
  Files         346      346              
  Lines       16953    16951       -2     
==========================================
- Hits        16039    16034       -5     
- Misses        714      716       +2     
- Partials      200      201       +1     

Flag	Coverage Δ
badger_v1	10.28% <0.00%> (+<0.01%)	⬆️
badger_v2	6.39% <0.00%> (-0.04%)	⬇️
cassandra-3.x-v1	18.12% <0.00%> (+<0.01%)	⬆️
cassandra-3.x-v2	6.14% <0.00%> (+<0.01%)	⬆️
cassandra-4.x-v1	18.12% <0.00%> (+<0.01%)	⬆️
cassandra-4.x-v2	6.14% <0.00%> (+0.02%)	⬆️
elasticsearch-5.x	5.73% <0.00%> (+<0.01%)	⬆️
elasticsearch-6.x	5.74% <0.00%> (+<0.01%)	⬆️
elasticsearch-7.x	5.74% <0.00%> (+<0.01%)	⬆️
elasticsearch-8.x	5.73% <0.00%> (-0.01%)	⬇️
grpc_v1	12.59% <75.00%> (+<0.01%)	⬆️
grpc_v2	11.35% <0.00%> (-0.04%)	⬇️
kafka	9.95% <0.00%> (+<0.01%)	⬆️
opensearch-1.x	5.74% <0.00%> (+<0.01%)	⬆️
opensearch-2.x	5.73% <0.00%> (-0.01%)	⬇️
unittests	91.47% <75.00%> (+0.06%)	⬆️

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