Fix errors reported by gocritic and enable

[bogdandrutu]

No description provided.

[codecov]

Codecov Report

Merging #1509 into master will increase coverage by 0.03%.
The diff coverage is 62.16%.

@@            Coverage Diff             @@
##           master    #1509      +/-   ##
==========================================
+ Coverage   91.26%   91.29%   +0.03%     
==========================================
  Files         239      239              
  Lines       16685    16686       +1     
==========================================
+ Hits        15227    15233       +6     
  Misses       1047     1047              
+ Partials      411      406       -5     

Impacted Files	Coverage Δ
exporter/otlpexporter/otlp.go	75.53% <0.00%> (+0.79%)	⬆️
processor/memorylimiter/memorylimiter.go	92.10% <0.00%> (+1.19%)	⬆️
processor/metrics.go	77.31% <33.33%> (+0.78%)	⬆️
receiver/fluentforwardreceiver/conversion.go	89.73% <50.00%> (+0.04%)	⬆️
exporter/opencensusexporter/factory.go	90.62% <75.00%> (+0.14%)	⬆️
...babilisticsamplerprocessor/probabilisticsampler.go	94.11% <100.00%> (ø)
receiver/prometheusreceiver/internal/logger.go	87.50% <100.00%> (ø)
...ceiver/prometheusreceiver/internal/metricfamily.go	98.98% <100.00%> (+<0.01%)	⬆️
...iver/prometheusreceiver/internal/metricsbuilder.go	100.00% <100.00%> (ø)
testutil/testutil.go	92.85% <100.00%> (ø)
... and 1 more

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