[v2] Replace e2e span_reader grpc.DialContext with NewClient

[james-ryans]

Which problem is this PR solving?

• resolves Migrate from grpc.Dial to grpc.NewClient #5330
• gRPC Dial & DialContext is now deprecated and requires to be replaced with NewClient https://github.com/grpc/grpc-go/blob/master/Documentation/anti-patterns.md#the-wrong-way-grpcdial

Description of the changes

• Replaces grpc.DialContext with NewClient at cmd/jaeger/internal/integration/span_reader.go

How was this change tested?

• Run STORAGE=grpc SPAN_STORAGE_TYPE=memory make jaeger-v2-storage-integration-test locally.

Checklist

• I have read https://github.com/jaegertracing/jaeger/blob/master/CONTRIBUTING_GUIDELINES.md
• I have signed all commits
• I have added unit tests for the new functionality
• I have run lint and test steps successfully
  • for jaeger: make lint test
  • for jaeger-ui: yarn lint and yarn test

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.47%. Comparing base (a2a9188) to head (3cdcdd0).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5443   +/-   ##
=======================================
  Coverage   95.47%   95.47%           
=======================================
  Files         331      331           
  Lines       16115    16115           
=======================================
  Hits        15385    15385           
  Misses        556      556           
  Partials      174      174           

Flag	Coverage Δ
badger_v1	8.07% <ø> (ø)
badger_v2	1.94% <ø> (?)
cassandra-3.x-v1	16.48% <ø> (ø)
cassandra-3.x-v2	1.86% <ø> (?)
cassandra-4.x-v1	16.48% <ø> (ø)
cassandra-4.x-v2	1.86% <ø> (ø)
elasticsearch-7.x	1.78% <ø> (+0.01%)	⬆️
elasticsearch-8.x	1.78% <ø> (+0.01%)	⬆️
grpc_v1	9.12% <ø> (ø)
grpc_v2	7.48% <ø> (-0.02%)	⬇️
kafka	9.81% <ø> (ø)
opensearch-1.x	1.77% <ø> (?)
opensearch-2.x	1.78% <ø> (?)
unittests	93.98% <ø> (ø)

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