Replace grpc-plugin storage type name with just grpc

[yurishkuro]

Which problem is this PR solving?

• Resolves [deprecation] Phase out grpc-plugin storage (sidecar via hashicorp-plugin) #4647

Description of the changes

• Add new storage type grpc and log warning if the old value grpc-plugin is used.

How was this change tested?

• CII

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 95.48%. Comparing base (98abc11) to head (130f1af).

Files	Patch %	Lines
plugin/storage/factory_config.go	0.00%	5 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5442      +/-   ##
==========================================
- Coverage   95.50%   95.48%   -0.03%     
==========================================
  Files         331      331              
  Lines       16107    16113       +6     
==========================================
+ Hits        15383    15385       +2     
- Misses        551      555       +4     
  Partials      173      173              

Flag	Coverage Δ
badger_v1	8.07% <0.00%> (-0.01%)	⬇️
badger_v2	1.94% <0.00%> (-0.01%)	⬇️
cassandra-3.x-v1	16.48% <0.00%> (-0.02%)	⬇️
cassandra-3.x-v2	1.86% <0.00%> (-0.01%)	⬇️
cassandra-4.x-v1	16.48% <0.00%> (-0.02%)	⬇️
cassandra-4.x-v2	1.86% <0.00%> (-0.01%)	⬇️
elasticsearch-7.x	1.78% <0.00%> (?)
elasticsearch-8.x	1.78% <0.00%> (?)
grpc_v1	9.12% <11.11%> (-0.01%)	⬇️
grpc_v2	7.49% <0.00%> (+<0.01%)	⬆️
kafka	9.81% <0.00%> (-0.01%)	⬇️
opensearch-1.x	1.77% <0.00%> (?)
opensearch-2.x	1.77% <0.00%> (?)
unittests	93.99% <33.33%> (-0.03%)	⬇️

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