Update libdatadog to v30.0, make CA root optional for profiling

[morrisonlevi]

Description

This supersedes #3734. In a recent libdatadog change, we unintentionally required that a CA root store be found even for non-HTTPS connections to the agent e.g. http:// and unix:// endpoints.

This PR targets the v30 release of libdatadog which includes the fix. It does this by updating the vendored libdatadog/ which was previously pointing to a commit on main to point to v30.0.0, and then updating the profiling/ crate to use path = "../libdatdog/....

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 68.84%. Comparing base (fd1ba67) to head (e45f220).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3758      +/-   ##
==========================================
- 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)

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see 1 file with indirect coverage changes

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[pr-commenter]

Benchmarks [ profiler ]

Benchmark execution time: 2026-03-30 21:16:17

Comparing candidate commit e45f220 in PR branch levi/profiling-v30 with baseline commit fd1ba67 in branch master.

Found 2 performance improvements and 0 performance regressions! Performance is the same for 26 metrics, 8 unstable metrics.

scenario:php-profiler-timeline-memory-with-profiler-and-timeline

• 🟩 cpu_user_time [-276.286ms; -221.334ms] or [-17.288%; -13.850%]
• 🟩 execution_time [-193.115ms; -105.785ms] or [-14.033%; -7.687%]

[datadog-datadog-prod-us1-2]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

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

_{This comment will be updated automatically if new data arrives.
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