Make stress test more realistic

[cijothomas]

For logs - removes the custom Resource, and let the default resource be automatically added. There isn't a super easy way to keep the default + add my own attribute, as setting my Resource overrides the default! Will fix this later.
This will make it consistent across traces and metrics which all use default Resources only.

For traces - adds a noop processor. Without processor, we are not measuring the real SDK cost. (We could alternatively use a processor with noop exporter as well)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (054b0c8) 62.4% compared to head (93d179d) 62.4%.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #1531   +/-   ##
=====================================
  Coverage   62.4%   62.4%           
=====================================
  Files        144     144           
  Lines      19891   19891           
=====================================
  Hits       12426   12426           
  Misses      7465    7465           

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