fix(trace): crash when disabled by webserver config

[morrisonlevi]

Description

I found this looking through crash reports. Bob surmised the issue when I shared it with him.

We haven't tested this theory yet. I'm pushing this PR so CI can package it up nicely for us, so we have installable artifacts to try to A/B test.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.95%. Comparing base (13d1512) to head (ebfea19).

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #3089      +/-   ##
============================================
- Coverage     74.72%   72.95%   -1.78%     
  Complexity     2790     2790              
============================================
  Files           112      139      +27     
  Lines         11042    15280    +4238     
  Branches          0     1047    +1047     
============================================
+ Hits           8251    11147    +2896     
- Misses         2791     3580     +789     
- Partials          0      553     +553     

Flag	Coverage Δ
appsec-extension	68.28% <ø> (?)
tracer-php	74.74% <ø> (+0.01%)	⬆️

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see 28 files with indirect coverage changes

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[pr-commenter]

Benchmarks [ tracer ]

Benchmark execution time: 2025-02-14 21:24:54

Comparing candidate commit ebfea19 in PR branch levi/fix-ddtrace_close_all_open_spans with baseline commit 13d1512 in branch master.

Found 2 performance improvements and 1 performance regressions! Performance is the same for 175 metrics, 0 unstable metrics.

scenario:ContextPropagationBench/benchInject64Bit

• 🟩 execution_time [-519.405ns; -190.595ns] or [-6.546%; -2.402%]

scenario:ContextPropagationBench/benchInject64Bit-opcache

• 🟩 execution_time [-532.342ns; -169.658ns] or [-6.620%; -2.110%]

scenario:TraceFlushBench/benchFlushTrace

• 🟥 execution_time [+1000.000ns; +1000.000ns] or [+100.000%; +100.000%]