Add OC to new metrics structure conversion.

[bogdandrutu]

Updates #1657

[codecov]

Codecov Report

Merging #1666 into master will increase coverage by 0.10%.
The diff coverage is 92.46%.

@@            Coverage Diff             @@
##           master    #1666      +/-   ##
==========================================
+ Coverage   92.09%   92.20%   +0.10%     
==========================================
  Files         263      265       +2     
  Lines       19285    19777     +492     
==========================================
+ Hits        17761    18235     +474     
- Misses       1108     1112       +4     
- Partials      416      430      +14     

Impacted Files	Coverage Δ
translator/internaldata/oc_to_old_metrics.go	88.95% <ø> (+0.06%)	⬆️
translator/internaldata/old_metrics_to_oc.go	92.03% <0.00%> (+0.48%)	⬆️
translator/internaldata/metrics_to_oc.go	92.35% <92.35%> (ø)
translator/internaldata/oc_to_metrics.go	93.05% <93.05%> (ø)
internal/data/testdata/metric.go	86.95% <0.00%> (+1.44%)	⬆️
translator/internaldata/resource_to_oc.go	88.88% <0.00%> (+1.85%)	⬆️
internal/data/metrics.go	91.30% <0.00%> (+10.14%)	⬆️

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