fix: remove some possible panics

[mathnogueira]

This PR solves some of the possible panics we might get when running tracetest. I used nilaway to detect them. I was going to integrate it on our pipeline, however, it still shows some false positive cases of panics, so I decided to postpone this action.

Changes

Fixes

Checklist

• tested locally
• added new dependencies
• updated the docs
• added a test

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[codecov]

Codecov Report

Attention: 29 lines in your changes are missing coverage. Please review.

Comparison is base (7bbafb4) 39.43% compared to head (924946d) 39.37%.
Report is 4 commits behind head on main.

❗ Current head 924946d differs from pull request most recent head 6145558. Consider uploading reports for the commit 6145558 to get more accurate results

Files	Patch %	Lines
server/traces/otel_converter.go	0.00%	15 Missing ⚠️
server/tracedb/signalfxdb.go	0.00%	6 Missing ⚠️
server/tracedb/elasticsearchdb.go	0.00%	3 Missing ⚠️
server/tracedb/tempodb.go	0.00%	3 Missing ⚠️
server/tracedb/azureappinsights.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3405      +/-   ##
==========================================
- Coverage   39.43%   39.37%   -0.07%     
==========================================
  Files         222      222              
  Lines       16974    17002      +28     
==========================================
  Hits         6694     6694              
- Misses       9694     9722      +28     
  Partials      586      586              

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[danielbdias]

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