feat!: Set a default service name (DD_SERVICE) when no service is configured

[zacharycmontoya]

Description

Adds a default service for the configuration if none was set in the DD_SERVICE environment variable or user configuration. This is a breaking change as previously a missing service would throw a configuration initialization error.

The default value will be set to the name of the executable.

Motivation

This aligns the cpp tracer behavior for an unconfigured DD_SERVICE with the expected behavior of all the tracers in our Config Consistency initiative.

Additional Notes

Also updates the parametric test so that the DD_ENV behavior works as expected.

This has been tested on Ubuntu 24.04 (run on a Windows machine in WSL), Windows 11, and macOS Monterey

Jira ticket: APMAPI-709 APMAPI-708

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-10-07 14:09:05

Comparing candidate commit bb5065c in PR branch zach.montoya/config-consistency/dd-service with baseline commit 85370e7 in branch main.

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

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.66%. Comparing base (85370e7) to head (bb5065c).
Report is 3 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #158   +/-   ##
=======================================
  Coverage   94.66%   94.66%           
=======================================
  Files          72       72           
  Lines        3804     3806    +2     
=======================================
+ Hits         3601     3603    +2     
  Misses        203      203           

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[dmehala]

I suggested changes to account for situations where the underlying function might fail on Darwin or Windows NT.