[executors] feat: make init of telemetry optional

[AndreyMarkinPPC]

• Emit telemetry data only if there's OTEL_EXPORTER_OTLP_ENDPOINT
• Add tracer initialization into a CLI entrypoint

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 88.51%. Comparing base (5ebb9d2) to head (b92e05e).
⚠️ Report is 11 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #187      +/-   ##
==========================================
+ Coverage   88.23%   88.51%   +0.28%     
==========================================
  Files          61       64       +3     
  Lines        2600     2664      +64     
==========================================
+ Hits         2294     2358      +64     
  Misses        306      306              

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