fix(ci): diagnose missing PHP language core dumps

[realFlowControl]

Description

Reuse the shared core artifact collector for profiler PHP language tests instead of checking only /usr/local/src/php/core. Record the effective core limit, kernel naming settings, source-directory writability, and disk space before the tests so failures without a dump remain diagnosable. Failed jobs now always have a diagnostic artifact, explicitly report when no ELF core was found, and still generate a GDB report when one is available.

Validation:

• Generated profiler child-pipeline YAML parses successfully.
• A forced PHP 8.3 ZTS crash in the CI image produced an ELF core artifact and GDB report.
• The no-core path produced the diagnostic artifact and explicit message.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[datadog-prod-us1-4]

 

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⚠️ Warnings

🚦 7 Pipeline jobs failed

DataDog/apm-reliability/dd-trace-php | test_extension_ci: [8.1]     

DataDog/apm-reliability/dd-trace-php | test_extension_ci: [8.2]     

DataDog/apm-reliability/dd-trace-php | test_extension_ci: [8.4]     

View all 7 failed jobs.

ℹ️ Info

No other issues found (see more)

🧪 All tests passed
❄️ No new flaky tests detected

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 60.68% (+0.01%)

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