fix(ci): skip valgrind-sensitive background-sender tests and increase live-debugger timeout

[Leiyks]

What

• Add valgrind skip guard to agent_sampling.phpt and agent_sampling-standalone-asm_{01,02,03}.phpt
• Increase debugger_span_probe_class.phpt collection window from 10s to 30s

Why

Background-sender tests (test_extension_ci on PHP 7.1 / 7.4 / 8.3): these tests use synchronous_flush (100ms default timeout) + network I/O via waitForDataAndReplay(). Under valgrind's 10–50× slowdown, the background sender thread never completes within 100ms, causing 300s process timeouts. The guard (USE_ZEND_ALLOC === '0') already exists in adjacent files (agent_sampling_sidecar.phpt) — these 4 were simply missing it.

Live-debugger test (min install tests): debugger_span_probe_class.phpt collects sidecar diagnostics in a do/while loop with a 10s window. For probe 1 (an already-resolved class), the sidecar sends INSTALLED asynchronously at hook-install time — before EMITTING fires. Under resource-constrained CI pods this async delivery can arrive after the window closes. 30s gives sufficient headroom.

How

• --SKIPIF-- block expanded in 4 files: adds if (getenv('USE_ZEND_ALLOC') === '0' && !getenv('SKIP_ASAN')) die('skip timing sensitive test - valgrind is too slow');
• debugger_span_probe_class.phpt:64: time() - 10 → time() - 30

Testing

• CI: test_extension_ci [7.1 / 7.4 / 8.3] expected green (valgrind pass no longer times out)
• CI: min install tests expected green (live-debugger probe collection has sufficient window)

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.84%. Comparing base (fd1ba67) to head (65c257e).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3754      +/-   ##
==========================================
- Coverage   68.85%   68.84%   -0.02%     
==========================================
  Files         166      166              
  Lines       19015    19015              
  Branches     1792     1792              
==========================================
- Hits        13093    13091       -2     
- Misses       5111     5114       +3     
+ Partials      811      810       -1     

Flag	Coverage Δ
helper-rust-integration	78.82% <ø> (ø)
helper-rust-unit	49.36% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.
see 1 file with indirect coverage changes

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[datadog-prod-us1-3]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

🎯 Code Coverage (details)
• Patch Coverage: 100.00%
• Overall Coverage: 60.68% (+0.00%)

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