Fix bug where the error logged when conversion of data fails is always nil

[bogdandrutu]

The problem was that in the logging statement (in all signals) we log err instead of cErr. The good part is that this is not a UB, because if we get to the point where that function is called, the err was nil otherwise and never modified again so not race condition in accessing it.

Separate the lambda function in a different function so we don't repeat the same mistake of capturing other params by mistake.

[codecov]

Codecov Report

Attention: Patch coverage is 65.90909% with 15 lines in your changes missing coverage. Please review.

Project coverage is 92.11%. Comparing base (216046a) to head (11227c2).
Report is 7 commits behind head on main.

Files with missing lines	Patch %	Lines
exporter/exporterhelper/logs.go	45.45%	4 Missing and 2 partials ⚠️
exporter/exporterhelper/metrics.go	72.72%	2 Missing and 1 partial ⚠️
exporter/exporterhelper/traces.go	72.72%	2 Missing and 1 partial ⚠️
...xporter/exporterhelper/xexporterhelper/profiles.go	72.72%	2 Missing and 1 partial ⚠️

❌ Your patch status has failed because the patch coverage (65.90%) is below the target coverage (95.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #12510      +/-   ##
==========================================
- Coverage   92.16%   92.11%   -0.06%     
==========================================
  Files         465      467       +2     
  Lines       25201    25252      +51     
==========================================
+ Hits        23226    23260      +34     
- Misses       1576     1590      +14     
- Partials      399      402       +3     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.