fix(comparison_dashboard): Properly collect engine metrics for the go collector

[JakeDern]

Change Summary

Update the sql reports to grab metrics for OTC.

What issue does this PR close?

• Closes Create dashboards comparing various telemetry protocols and engines #2855

How are these changes tested?

Are there any user-facing changes?

No.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.91%. Comparing base (dbd487c) to head (9d7f14e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2971      +/-   ##
==========================================
- Coverage   85.91%   85.91%   -0.01%     
==========================================
  Files         725      725              
  Lines      275323   275323              
==========================================
- Hits       236541   236539       -2     
- Misses      38258    38260       +2     
  Partials      524      524              

Components	Coverage Δ
otap-dataflow	87.03% <ø> (-0.01%)	⬇️
query_abstraction	80.61% <ø> (ø)
query_engine	89.57% <ø> (ø)
otel-arrow-go	52.45% <ø> (ø)
quiver	92.25% <ø> (ø)

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