Improve message for New funcs in pdata

[bogdandrutu]

Updates #4254

Try to remove the confusion that the pdata.Metrics cannot be constructed.

Signed-off-by: Bogdan Drutu [email protected]

[codecov]

Codecov Report

Merging #4402 (c8a77d0) into main (a0d9d43) will increase coverage by 0.09%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #4402      +/-   ##
==========================================
+ Coverage   90.31%   90.40%   +0.09%     
==========================================
  Files         177      177              
  Lines       10338    10333       -5     
==========================================
+ Hits         9337     9342       +5     
+ Misses        779      774       -5     
+ Partials      222      217       -5     

Impacted Files	Coverage Δ
model/pdata/generated_common.go	100.00% <ø> (ø)
model/pdata/generated_log.go	96.65% <ø> (ø)
model/pdata/generated_metrics.go	96.98% <ø> (ø)
model/pdata/generated_resource.go	100.00% <ø> (ø)
model/pdata/generated_trace.go	96.88% <ø> (ø)
exporter/loggingexporter/config.go	100.00% <0.00%> (ø)
exporter/loggingexporter/logging_exporter.go	93.47% <0.00%> (+3.05%)	⬆️
exporter/loggingexporter/factory.go	77.35% <0.00%> (+4.14%)	⬆️
service/config_watcher.go	100.00% <0.00%> (+12.50%)	⬆️

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