Don't override system resource attrs in default config

[rmfitzpatrick]

Any host.name and os.type resource attributes that have been set should be respected instead of overridden by our provided resource detection processor instance. Otherwise there is the potential for masking the actual data source.

[codecov]

Codecov Report

Merging #239 (60b0c50) into main (0ef8ec7) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #239   +/-   ##
=======================================
  Coverage   89.01%   89.01%           
=======================================
  Files          18       18           
  Lines        1020     1020           
=======================================
  Hits          908      908           
  Misses         78       78           
  Partials       34       34           

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