Collect agent info and apply the env for remote config

[bwoebi]

It basically sets the datadog.env INI at runtime (at a couple important locations - at start and once when actually sampling).

This ensures agent sampling is correct, and RC targets the right env.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.16%. Comparing base (e2b0a15) to head (074196b).
Report is 5 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2930      +/-   ##
============================================
- Coverage     73.62%   72.16%   -1.46%     
  Complexity     2529     2529              
============================================
  Files           109      136      +27     
  Lines         10410    14452    +4042     
  Branches          0      991     +991     
============================================
+ Hits           7664    10429    +2765     
- Misses         2746     3477     +731     
- Partials          0      546     +546     

Flag	Coverage Δ
appsec-extension	68.40% <ø> (?)
tracer-php	73.62% <ø> (ø)

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see 27 files with indirect coverage changes

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[pr-commenter]

Benchmarks [ tracer ]

Benchmark execution time: 2024-11-14 22:42:41

Comparing candidate commit 074196b in PR branch agent-info with baseline commit e2b0a15 in branch master.

Found 2 performance improvements and 1 performance regressions! Performance is the same for 175 metrics, 0 unstable metrics.

scenario:EmptyFileBench/benchEmptyFileOverhead

• 🟩 execution_time [-225.145µs; -115.355µs] or [-6.827%; -3.498%]

scenario:SamplingRuleMatchingBench/benchGlobMatching2

• 🟥 execution_time [+57.696ns; +148.904ns] or [+2.602%; +6.716%]

scenario:TraceFlushBench/benchFlushTrace

• 🟩 execution_time [-1000.000ns; -1000.000ns] or [-50.000%; -50.000%]