exporter/signalfx: Trim disk and network translation rules

[asuresh4]

Description: Remove certain disk/network translations.

Testing: Updated tests.

[codecov]

Codecov Report

Merging #2457 (a4ba8fa) into main (768426b) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #2457      +/-   ##
==========================================
- Coverage   90.93%   90.91%   -0.02%     
==========================================
  Files         411      411              
  Lines       20467    20467              
==========================================
- Hits        18611    18608       -3     
- Misses       1395     1397       +2     
- Partials      461      462       +1     

Flag	Coverage Δ
integration	69.22% <ø> (ø)
unit	89.76% <ø> (-0.02%)	⬇️

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Impacted Files	Coverage Δ
receiver/k8sclusterreceiver/watcher.go	95.29% <0.00%> (-2.36%)	⬇️
processor/groupbytraceprocessor/event.go	95.96% <0.00%> (-0.81%)	⬇️

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