Enable Lint Rule: unexported-naming

[FlamingSaint]

Which problem is this PR solving?

• Partial Fix for Enable more revive linter rules #5506

Description of the changes

• Enabled unexported-naming in revive linter.
• Changed local variables to start with lowercase letters.

How was this change tested?

• make lint make test

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 96.19%. Comparing base (fd1b39e) to head (9d44d49).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5511   +/-   ##
=======================================
  Coverage   96.19%   96.19%           
=======================================
  Files         327      327           
  Lines       16012    16012           
=======================================
  Hits        15403    15403           
  Misses        435      435           
  Partials      174      174           

Flag	Coverage Δ
badger_v1	8.05% <ø> (ø)
badger_v2	1.93% <ø> (ø)
cassandra-3.x-v1	16.43% <ø> (ø)
cassandra-3.x-v2	1.85% <ø> (ø)
cassandra-4.x-v1	16.43% <ø> (ø)
cassandra-4.x-v2	1.85% <ø> (ø)
elasticsearch-7-v1	18.88% <ø> (ø)
elasticsearch-8-v1	19.07% <ø> (ø)
elasticsearch-8-v2	19.08% <ø> (+0.01%)	⬆️
grpc_v1	9.48% <ø> (ø)
grpc_v2	7.53% <ø> (ø)
kafka	9.78% <ø> (ø)
opensearch-1-v1	18.92% <ø> (ø)
opensearch-2-v1	18.94% <ø> (+0.01%)	⬆️
opensearch-2-v2	18.94% <ø> (ø)
unittests	93.89% <ø> (ø)

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[yurishkuro]

Thanks!