Simplifiy OTLP Example Resource creation

[cijothomas]

Resource needs to be handed over to each provider, so it must be created or cloned anyway.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.1%. Comparing base (e68fe94) to head (e88d7d0).
Report is 1 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #2660   +/-   ##
=====================================
  Coverage   79.1%   79.1%           
=====================================
  Files        120     120           
  Lines      22556   22556           
=====================================
  Hits       17857   17857           
  Misses      4699    4699           

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[cijothomas]

On second thought, this is not good, as it need to detect resources again and again. Better to use OnceLock and clone.
Let me change