feat(prof): use reqwest to send profiles to agent

[morrisonlevi]

Description

Evaluate using reqwest directly instead of using libdatadog's profiling exporter. Specifically, look at the Unix Domain Sockets (UDS) support.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[pr-commenter]

Benchmarks [ profiler ]

Benchmark execution time: 2025-07-15 22:09:05

Comparing candidate commit ba8f818 in PR branch levi/reqwest with baseline commit 60f33e9 in branch levi/cargo-deps.

Found 1 performance improvements and 0 performance regressions! Performance is the same for 26 metrics, 9 unstable metrics.

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

• 🟩 max_rss_usage [-1.444MB; -0.706MB] or [-4.530%; -2.217%]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.72%. Comparing base (60f33e9) to head (25d0c84).

Additional details and impacted files

@@                 Coverage Diff                 @@
##           levi/cargo-deps    #3340      +/-   ##
===================================================
- Coverage            61.83%   61.72%   -0.12%     
===================================================
  Files                  140      140              
  Lines                12318    12318              
  Branches              1617     1617              
===================================================
- Hits                  7617     7603      -14     
- Misses                3989     4002      +13     
- Partials               712      713       +1     

see 2 files with indirect coverage changes

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