fix(otel): Don't use scope for otel transaction name

[AbhiPrasad]

Fixes #596

This is a hack - so open to keep iterating on this, but in the spirit of just fixing this asap to ship I opened this PR.

This change makes it so that if there is a span description set, use that as the transaction name.

Nothing should be setting this for transactions, as we don't expose this API anywhere, so we should be safe to only make this work for otel.

Draft for now, thoughts appreciated!

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.07 🎉

Comparison is base (27e50ad) 78.85% compared to head (bd144f4) 78.93%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #602      +/-   ##
==========================================
+ Coverage   78.85%   78.93%   +0.07%     
==========================================
  Files          38       38              
  Lines        3869     3869              
==========================================
+ Hits         3051     3054       +3     
+ Misses        714      712       -2     
+ Partials      104      103       -1     

Impacted Files	Coverage Δ
otel/span_processor.go	94.33% <100.00%> (+2.52%)	⬆️
tracing.go	88.24% <100.00%> (+0.10%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[AbhiPrasad]

Closing because I jumped the gun 😬 - but we'll be chatting about this later today to make:

TRACING API V2 (the better one™️) 🫡