Use #[cfg(unix)] for Unix-like OS detection

[AaronRM]

Update the platform-specific configuration for enabling the set_reuse_port socket option from only Linux and macOS to all Unix-like systems, which improves portability.

[cijothomas]

LGTM!

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.09%. Comparing base (5d1c03b) to head (64d54cd).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1617      +/-   ##
==========================================
- Coverage   84.10%   84.09%   -0.01%     
==========================================
  Files         446      446              
  Lines      126483   126483              
==========================================
- Hits       106380   106370      -10     
- Misses      19569    19579      +10     
  Partials      534      534              

Components	Coverage Δ
otap-dataflow	85.85% <ø> (-0.02%)	⬇️
query_abstraction	80.61% <ø> (ø)
query_engine	89.98% <ø> (ø)
syslog_cef_receivers	∅ <ø> (∅)
otel-arrow-go	53.50% <ø> (ø)

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