refactor: move all config related code under config directory

[watson]

What does this PR do?

Move all code related to configuration into the config directory (both regular code and test):

• packages/dd-trace/src/{config_defaults.js => config/defaults.js}
• packages/dd-trace/src/{ => config}/git_properties.js
• packages/dd-trace/src/{config-helper.js => config/helper.js}
• packages/dd-trace/src/{config.js => config/index.js}
• packages/dd-trace/src/{config_stable.js => config/stable.js}
• packages/dd-trace/src/{ => config}/supported-configurations.json
• packages/dd-trace/test/{ => config}/git_properties.spec.js
• packages/dd-trace/test/{config.spec.js => config/index.spec.js}

Motivation

Improved overview, encapsulation, and code ownership.

[watson]

• refactor: move all config related code under config directory #7204 👈 (View in Graphite)
• feat(debugger): add Remote Enablement support #7137
• refactor(remote_config): move capability registration to feature modules #7127
• refactor(remote_config): move appsec-specific logic to appsec folder #7122
• refactor(remote-config): replace kPreUpdate with batch handler API (DEBUG-4402) #7121
• master

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[github-actions]

Overall package size

Self size: 4.41 MB
Deduped: 5.24 MB
No deduping: 5.24 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | import-in-the-middle | 2.0.0 | 68.46 kB | 797.03 kB | | dc-polyfill | 0.1.10 | 26.73 kB | 26.73 kB |

_{🤖 This report was automatically generated by heaviest-objects-in-the-universe}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.14%. Comparing base (772fc3b) to head (54cc87f).
⚠️ Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7204      +/-   ##
==========================================
+ Coverage   85.12%   85.14%   +0.02%     
==========================================
  Files         529      532       +3     
  Lines       22866    22897      +31     
==========================================
+ Hits        19464    19495      +31     
  Misses       3402     3402              

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[pr-commenter]

Benchmarks

Benchmark execution time: 2026-01-19 20:24:58

Comparing candidate commit 54cc87f in PR branch watson/refactor-config with baseline commit 772fc3b in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 233 metrics, 27 unstable metrics.

[simon-id]

looks reasonable