Fix: Should not capture unfinished transaction

[maciejwalkowiak]

📜 Description

Should not capture unfinished transaction.

💡 Motivation and Context

Fixes #1704

💚 How did you test it?

Unit tests.

📝 Checklist

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

[codecov-commenter]

Codecov Report

Merging #1719 (9eba4eb) into main (7cd5740) will not change coverage.
The diff coverage is 58.33%.

@@            Coverage Diff            @@
##               main    #1719   +/-   ##
=========================================
  Coverage     75.04%   75.04%           
  Complexity     2099     2099           
=========================================
  Files           211      211           
  Lines          7514     7514           
  Branches        791      791           
=========================================
  Hits           5639     5639           
  Misses         1492     1492           
  Partials        383      383           

Impacted Files	Coverage Δ
sentry/src/main/java/io/sentry/Hub.java	74.17% <58.33%> (ø)

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