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]

Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• 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

This stack of pull requests is managed by Graphite. Learn more about stacking.

[github-actions]

Overall package size

Self size: 4.39 MB
Deduped: 5.22 MB
No deduping: 5.22 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 84.51%. Comparing base (9317837) to head (c73e589).

Additional details and impacted files

@@                         Coverage Diff                          @@
##           watson/DEBUG-4402/remote-enablement    #7204   +/-   ##
====================================================================
  Coverage                                84.50%   84.51%           
====================================================================
  Files                                      532      532           
  Lines                                    22741    22745    +4     
====================================================================
+ Hits                                     19218    19222    +4     
  Misses                                    3523     3523           

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[pr-commenter]

Benchmarks

Benchmark execution time: 2026-01-09 12:42:27

Comparing candidate commit c73e589 in PR branch watson/refactor-config with baseline commit 9317837 in branch watson/DEBUG-4402/remote-enablement.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 291 metrics, 29 unstable metrics.