Concurrent profiling 2 - added list of transactions

[stefanosiano]

📜 Description

We want to support concurrent transactions. In order to do it, we are going to add the list of transactions occurred during a profile.
This pr adds the list of transactions occurred during a profile to the data sent in the envelope payload.
This is the second part of concurrent profiling support, after this pr

💡 Motivation and Context

We want to avoid situations where the user cannot profile his transaction due to automatic transactions occurring at the same time, as pointed in this issue
The strategy we will follow is described here

💚 How did you test it?

Added unit test to check concurrent profiling logic
Added ui test to check the timestamps of transactions occurred during a profile

📝 Checklist

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

🔮 Next steps

[codecov-commenter]

Codecov Report

Merging #2218 (6a763b7) into feat/concurrent-profiling-data (4abe8f5) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@                         Coverage Diff                          @@
##             feat/concurrent-profiling-data    #2218      +/-   ##
====================================================================
- Coverage                             80.45%   80.42%   -0.04%     
  Complexity                             3366     3366              
====================================================================
  Files                                   241      241              
  Lines                                 12416    12421       +5     
  Branches                               1652     1653       +1     
====================================================================
  Hits                                   9989     9989              
- Misses                                 1804     1809       +5     
  Partials                                623      623              

Impacted Files	Coverage Δ
.../src/main/java/io/sentry/util/CollectionUtils.java	44.44% <0.00%> (-10.11%)	⬇️

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