Reset ddtrace_endpoint properly

[bwoebi]

Make sure that dogstatsd_endpoint and ddtrace_endpoint are always freed together and the existence governed by ddtrace_endpoint.

Follow-up to #3407.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.75%. Comparing base (9298487) to head (525d73a).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3451      +/-   ##
==========================================
- Coverage   61.89%   61.75%   -0.14%     
==========================================
  Files         141      141              
  Lines       12501    12501              
  Branches     1633     1633              
==========================================
- Hits         7737     7720      -17     
- Misses       4042     4058      +16     
- Partials      722      723       +1     

see 4 files with indirect coverage changes

---

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[pr-commenter]

Benchmarks [ tracer ]

Benchmark execution time: 2025-10-17 17:25:13

Comparing candidate commit 525d73a in PR branch bob/fix-sidecar-vars with baseline commit 9298487 in branch master.

Found 1 performance improvements and 7 performance regressions! Performance is the same for 186 metrics, 0 unstable metrics.

scenario:ComposerTelemetryBench/benchTelemetryParsing

• 🟥 execution_time [+442.675ns; +1357.325ns] or [+4.176%; +12.805%]

scenario:MessagePackSerializationBench/benchMessagePackSerialization-opcache

• 🟥 execution_time [+2.253µs; +3.307µs] or [+2.101%; +3.085%]

scenario:SamplingRuleMatchingBench/benchRegexMatching1

• 🟥 execution_time [+93.172ns; +133.228ns] or [+8.040%; +11.496%]

scenario:SamplingRuleMatchingBench/benchRegexMatching2

• 🟥 execution_time [+65.561ns; +124.239ns] or [+5.509%; +10.440%]

scenario:SamplingRuleMatchingBench/benchRegexMatching3

• 🟥 execution_time [+109.139ns; +165.061ns] or [+9.357%; +14.151%]

scenario:SamplingRuleMatchingBench/benchRegexMatching4

• 🟥 execution_time [+66.592ns; +114.408ns] or [+5.671%; +9.743%]

scenario:SpanBench/benchOpenTelemetryAPI

• 🟥 mem_peak [+1.696MB; +1.702MB] or [+4.103%; +4.118%]

scenario:TraceSerializationBench/benchSerializeTrace

• 🟩 execution_time [-28.887µs; -14.813µs] or [-6.542%; -3.355%]