[bug] [hotrod] Delay env var mapping until logger is initialized

[yurishkuro]

Which problem is this PR solving?

• Resolves [Bug]: HotRod run failed if using the old env variable #5759

Description of the changes

• Invoke mapping function (which takes logger) after the logger is initialized
• It is safe to do because none of the env vars control the logic for logger initialization

How was this change tested?

• $ JAEGER_AGENT_PORT=xyz go run ./examples/hotrod all
• Before the change this command would cause a panic

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.65%. Comparing base (d3c7d67) to head (fffb275).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5760      +/-   ##
==========================================
- Coverage   96.67%   96.65%   -0.03%     
==========================================
  Files         341      341              
  Lines       16451    16451              
==========================================
- Hits        15904    15900       -4     
- Misses        360      362       +2     
- Partials      187      189       +2     

Flag	Coverage Δ
badger_v1	8.05% <ø> (ø)
badger_v2	1.90% <ø> (ø)
cassandra-3.x-v1	16.61% <ø> (ø)
cassandra-3.x-v2	1.82% <ø> (ø)
cassandra-4.x-v1	16.61% <ø> (ø)
cassandra-4.x-v2	1.82% <ø> (ø)
elasticsearch-6.x-v1	18.77% <ø> (-0.02%)	⬇️
elasticsearch-7.x-v1	18.84% <ø> (ø)
elasticsearch-8.x-v1	19.02% <ø> (ø)
elasticsearch-8.x-v2	1.90% <ø> (+0.01%)	⬆️
grpc_v1	9.52% <ø> (ø)
grpc_v2	7.46% <ø> (-0.02%)	⬇️
kafka	9.74% <ø> (ø)
memory_v2	1.90% <ø> (ø)
opensearch-1.x-v1	18.89% <ø> (+0.01%)	⬆️
opensearch-2.x-v1	18.88% <ø> (-0.02%)	⬇️
opensearch-2.x-v2	1.90% <ø> (ø)
unittests	95.07% <ø> (-0.03%)	⬇️

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