Fix: drop spans in BeforeSpanCallback.

[maciejwalkowiak]

📜 Description

Fix: drop spans in BeforeSpanCallback. #1713

💡 Motivation and Context

Fixes #1708

💚 How did you test it?

📝 Checklist

• I reviewed the submitted code
• I added tests to verify the changes
• I updated the docs if needed
• No breaking changes

#skip-changelog

[codecov-commenter]

Codecov Report

Merging #1713 (2b6da6a) into main (21b6126) will increase coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main    #1713      +/-   ##
============================================
+ Coverage     75.07%   75.08%   +0.01%     
- Complexity     2098     2099       +1     
============================================
  Files           211      211              
  Lines          7506     7511       +5     
  Branches        789      790       +1     
============================================
+ Hits           5635     5640       +5     
  Misses         1490     1490              
  Partials        381      381              

Impacted Files	Coverage Δ
sentry/src/main/java/io/sentry/SpanContext.java	93.75% <ø> (ø)
...in/java/io/sentry/openfeign/SentryFeignClient.java	96.22% <100.00%> (+0.30%)	⬆️
...ain/java/io/sentry/protocol/SentryTransaction.java	92.68% <100.00%> (+0.18%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 21b6126...2b6da6a. Read the comment docs.

[marandaneto]

this one should have a changelog since beta.1 has been published, adding it