otelconf: use translation strategy instead of deprecated funcs

[codeboten]

This fixes an issue in the otelconf package that was preventing the Collector from upgrading to the latest version of the library. The issue is that the prometheus exporter uses a translation strategy that could not be changed with the existing configuration options, and this changed the output from the exporter, breaking backwards compat for the collector when upgrading to otelconf v0.20.0. See open-telemetry/opentelemetry-collector#14602 (review) for more details.

[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 82.1%. Comparing base (d2a5807) to head (e8ed446).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
otelconf/v0.2.0/metric.go	50.0%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##            main   #8595     +/-   ##
=======================================
- Coverage   82.1%   82.1%   -0.1%     
=======================================
  Files        179     179             
  Lines      13662   13662             
=======================================
- Hits       11229   11227      -2     
- Misses      2032    2033      +1     
- Partials     401     402      +1     

Files with missing lines	Coverage Δ
otelconf/v0.3.0/metric.go	89.7% <100.0%> (ø)
otelconf/v0.2.0/metric.go	88.9% <50.0%> (-0.7%)	⬇️

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[codeboten]

I dont think the lint check failure is related to changes in this pr