[refactor] Change extension_test.go to use GetTraceStoreFactory instead of GetStorageFactory

[mahadzaryab1]

Which problem is this PR solving?

• Resolves Remove usages of GetStorageFactory #6564

Description of the changes

• Removes the final usage of GetStorageFactory from extension_test.go by replacing it with GetTraceStoreFactory

How was this change tested?

• CI

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: npm run lint and npm run test

[mahadzaryab1]

This PR will be followed up by #6697

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.02%. Comparing base (3bb01fd) to head (453c6f1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6696      +/-   ##
==========================================
+ Coverage   95.99%   96.02%   +0.02%     
==========================================
  Files         363      363              
  Lines       20568    20568              
==========================================
+ Hits        19745    19750       +5     
+ Misses        628      624       -4     
+ Partials      195      194       -1     

Flag	Coverage Δ
badger_v1	9.82% <ø> (ø)
badger_v2	1.82% <0.00%> (ø)
cassandra-4.x-v1-manual	14.79% <ø> (ø)
cassandra-4.x-v2-auto	1.81% <0.00%> (ø)
cassandra-4.x-v2-manual	1.81% <0.00%> (ø)
cassandra-5.x-v1-manual	14.79% <ø> (ø)
cassandra-5.x-v2-auto	1.81% <0.00%> (ø)
cassandra-5.x-v2-manual	1.81% <0.00%> (ø)
elasticsearch-6.x-v1	19.12% <ø> (ø)
elasticsearch-7.x-v1	19.20% <ø> (ø)
elasticsearch-8.x-v1	19.37% <ø> (ø)
elasticsearch-8.x-v2	1.93% <0.00%> (+0.11%)	⬆️
grpc_v1	10.80% <ø> (ø)
grpc_v2	7.80% <0.00%> (ø)
kafka-3.x-v1	10.12% <ø> (ø)
kafka-3.x-v2	1.82% <0.00%> (ø)
memory_v2	1.82% <0.00%> (ø)
opensearch-1.x-v1	19.25% <ø> (ø)
opensearch-2.x-v1	19.25% <ø> (ø)
opensearch-2.x-v2	1.82% <0.00%> (ø)
tailsampling-processor	0.48% <0.00%> (ø)
unittests	94.90% <100.00%> (+0.02%)	⬆️

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