Add tests for anonymizer/app/query.

[shanukun]

Which problem is this PR solving?

• Part of Implement missing unit tests #5068

Description of the changes

• This commit adds tests for the cmd/anonymizer/app/query package.

How was this change tested?

• go test ./cmd/anonymizer/app/query -v -cover (85.7%)

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

[yurishkuro]

Thanks!

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.33%. Comparing base (d8185ac) to head (3536b5e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5638      +/-   ##
==========================================
+ Coverage   96.20%   96.33%   +0.13%     
==========================================
  Files         327      327              
  Lines       16014    16016       +2     
==========================================
+ Hits        15406    15429      +23     
+ Misses        432      408      -24     
- Partials      176      179       +3     

Flag	Coverage Δ
badger_v1	8.05% <ø> (ø)
badger_v2	1.93% <ø> (ø)
cassandra-3.x-v1	16.45% <ø> (ø)
cassandra-3.x-v2	1.85% <ø> (ø)
cassandra-4.x-v1	16.45% <ø> (ø)
cassandra-4.x-v2	1.85% <ø> (ø)
elasticsearch-7.x-v1	18.88% <ø> (-0.02%)	⬇️
elasticsearch-8.x-v1	19.09% <ø> (+0.01%)	⬆️
elasticsearch-8.x-v2	19.07% <ø> (-0.02%)	⬇️
grpc_v1	9.48% <ø> (ø)
grpc_v2	7.53% <ø> (ø)
kafka	9.77% <ø> (ø)
opensearch-1.x-v1	18.94% <ø> (+0.01%)	⬆️
opensearch-2.x-v1	18.93% <ø> (ø)
opensearch-2.x-v2	18.93% <ø> (-0.02%)	⬇️
unittests	94.21% <100.00%> (+0.13%)	⬆️

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