Implement new SSI configuration telemetry

[iamluc]

Description

Implement https://docs.google.com/document/d/1wydXj2fW0V0jaWU6W9pIbipT_AXD15tmbTtOPXFBEy4/edit?tab=t.nun42691l9k2 for PHP

https://datadoghq.atlassian.net/browse/INPLAT-577

System-tests PR: https://github.com/DataDog/system-tests/pull/4797

Reviewer checklist

• [ ] Test coverage seems ok.
• [ ] Appropriate labels assigned.

[pr-commenter[bot]]

Benchmarks [ tracer ]

Benchmark execution time: 2025-07-21 16:24:12

Comparing candidate commit c525ae0dfbcd07a39ccacd36b5d6bbd9f1a571a8 in PR branch luc/ssi-config-telemetry with baseline commit 779da23c7ea5888308b647bbdb71fc69bf728fb3 in branch master.

Found 1 performance improvements and 0 performance regressions! Performance is the same for 177 metrics, 0 unstable metrics.

scenario:PDOBench/benchPDOBaseline-opcache

• 🟩 execution_time [-5.819µs; -5.458µs] or [-8.686%; -8.148%]

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 61.80%. Comparing base (779da23) to head (c525ae0). Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3301      +/-   ##
==========================================
- Coverage   61.92%   61.80%   -0.12%     
==========================================
  Files         140      140              
  Lines       12356    12356              
  Branches     1616     1616              
==========================================
- Hits         7651     7637      -14     
- Misses       3995     4008      +13     
- Partials      710      711       +1     

see 2 files with indirect coverage changes

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