Sample propagate event

[ZStriker19]

What does this PR do?

Motivation:

Change log entry

Additional Notes:

How to test the change?

[github-actions]

👋 Hey @DataDog/ruby-guild, please fill "Change log entry" section in the pull request description.

If changes need to be present in CHANGELOG.md you can state it this way

**Change log entry**

Yes. A brief summary to be placed into the CHANGELOG.md

(possible answers Yes/Yep/Yeah)

Or you can opt out like that

**Change log entry**

None.

(possible answers No/Nope/None)

^{Visited at: 2025-04-22 18:28:28 UTC}

[datadog-datadog-prod-us1]

Datadog Report

Branch report: sample_propagate_event
Commit report: 78529d2
Test service: dd-trace-rb

✅ 0 Failed, 20808 Passed, 1373 Skipped, 3m 31.84s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-05-06 18:33:49

Comparing candidate commit 8bd00de in PR branch sample_propagate_event with baseline commit 1b96ec8 in branch master.

Found 0 performance improvements and 4 performance regressions! Performance is the same for 27 metrics, 2 unstable metrics.

scenario:line instrumentation - targeted

• 🟥 throughput [-13577.823op/s; -13216.195op/s] or [-8.226%; -8.006%]

scenario:method instrumentation

• 🟥 throughput [-12228.613op/s; -11346.387op/s] or [-6.924%; -6.425%]

scenario:profiler - stack collector

• 🟥 throughput [-175.508op/s; -173.970op/s] or [-6.048%; -5.995%]

scenario:tracing - trace.to_digest

• 🟥 throughput [-18513.395op/s; -17976.291op/s] or [-11.658%; -11.320%]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.72%. Comparing base (1b96ec8) to head (78529d2).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4597      +/-   ##
==========================================
- Coverage   97.73%   97.72%   -0.02%     
==========================================
  Files        1415     1415              
  Lines       86247    86243       -4     
  Branches     4359     4358       -1     
==========================================
- Hits        84293    84278      -15     
- Misses       1954     1965      +11     

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[p-datadog]

@ZStriker19 can you please fill out the PR template?