[test-optimization] [SDTEST-1821] Implement impacted tests detection

[Mariovido]

What does this PR do?

Implements the Impacted Tests Detection feature for CI Visibility (milestones 1.X):

• Identifies test cases that have been modified or impacted, i.e., any test with changes to its code lines.
• Marks impacted tests with the test.is_modified:true tag.
• Enables Early Flake Detection for tests flagged as impacted.

Frameworks that get support with this PR are:

• Jest
• Mocha
• Cucumber
• Cypress

Frameworks that not get supported with this PR and why:

• Playwright → We cannot get the original fn, the one that we can retrieve is formatted. Only will work with API.
• Vitest → We cannot get the start line of the method, neither the fn isolated. Only will work with API.

Motivation

We want to give support in the Node framework to this new feature.

Plugin Checklist

• Unit tests.
• TypeScript definitions.
• TypeScript tests.
• API documentation.
• CircleCI jobs/workflows.
• Plugin is exported.

Additional Notes

[github-actions]

Overall package size

Self size: 9.4 MB
Deduped: 102.64 MB
No deduping: 103.16 MB

Dependency sizes

| name | version | self size | total size | |------|---------|-----------|------------| | @datadog/libdatadog | 0.5.1 | 29.73 MB | 29.73 MB | | @datadog/native-appsec | 8.5.2 | 19.33 MB | 19.34 MB | | @datadog/native-iast-taint-tracking | 3.3.1 | 13.99 MB | 13.99 MB | | @datadog/pprof | 5.7.1 | 9.51 MB | 9.88 MB | | @opentelemetry/core | 1.30.1 | 908.66 kB | 7.16 MB | | protobufjs | 7.4.0 | 2.77 MB | 5.42 MB | | @datadog/wasm-js-rewriter | 4.0.0 | 2.85 MB | 3.58 MB | | @datadog/native-metrics | 3.1.1 | 1.02 MB | 1.43 MB | | @opentelemetry/api | 1.8.0 | 1.21 MB | 1.21 MB | | import-in-the-middle | 1.13.1 | 117.64 kB | 839.26 kB | | source-map | 0.7.4 | 226 kB | 226 kB | | opentracing | 0.14.7 | 194.81 kB | 194.81 kB | | lru-cache | 7.18.3 | 133.92 kB | 133.92 kB | | pprof-format | 2.1.0 | 111.69 kB | 111.69 kB | | @datadog/sketches-js | 2.1.1 | 109.9 kB | 109.9 kB | | lodash.sortby | 4.7.0 | 75.76 kB | 75.76 kB | | ignore | 5.3.2 | 53.63 kB | 53.63 kB | | istanbul-lib-coverage | 3.2.0 | 29.34 kB | 29.34 kB | | rfdc | 1.4.1 | 27.15 kB | 27.15 kB | | @isaacs/ttlcache | 1.4.1 | 25.2 kB | 25.2 kB | | dc-polyfill | 0.1.8 | 25.08 kB | 25.08 kB | | tlhunter-sorted-set | 0.1.0 | 24.94 kB | 24.94 kB | | shell-quote | 1.8.2 | 23.54 kB | 23.54 kB | | limiter | 1.1.5 | 23.17 kB | 23.17 kB | | retry | 0.13.1 | 18.85 kB | 18.85 kB | | semifies | 1.0.0 | 15.84 kB | 15.84 kB | | jest-docblock | 29.7.0 | 8.99 kB | 12.76 kB | | crypto-randomuuid | 1.0.0 | 11.18 kB | 11.18 kB | | ttl-set | 1.0.0 | 4.61 kB | 9.69 kB | | path-to-regexp | 0.1.12 | 6.6 kB | 6.6 kB | | koalas | 1.0.2 | 6.47 kB | 6.47 kB | | module-details-from-path | 1.0.3 | 4.47 kB | 4.47 kB |

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

[codecov]

Codecov Report

Attention: Patch coverage is 35.63218% with 112 lines in your changes missing coverage. Please review.

Project coverage is 79.05%. Comparing base (38f62e9) to head (ce58841).
Report is 13 commits behind head on master.

Files with missing lines	Patch %	Lines
packages/datadog-instrumentations/src/cucumber.js	0.00%	49 Missing ⚠️
...ackages/datadog-instrumentations/src/mocha/main.js	0.00%	21 Missing ⚠️
...ckages/datadog-instrumentations/src/mocha/utils.js	0.00%	11 Missing ⚠️
packages/datadog-plugin-mocha/src/index.js	0.00%	10 Missing ⚠️
packages/dd-trace/src/plugins/util/test.js	78.26%	10 Missing ⚠️
packages/datadog-plugin-cucumber/src/index.js	0.00%	5 Missing ⚠️
...ci-visibility/impacted-tests/get-modified-tests.js	80.95%	4 Missing ⚠️
packages/dd-trace/src/plugins/util/git.js	50.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5543      +/-   ##
==========================================
- Coverage   79.38%   79.05%   -0.34%     
==========================================
  Files         516      515       -1     
  Lines       23403    23578     +175     
==========================================
+ Hits        18579    18640      +61     
- Misses       4824     4938     +114     

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[datadog-datadog-prod-us1]

Datadog Report

Branch report: mario.vidal/impacted_tests
Commit report: 5a2082d
Test service: dd-trace-js-integration-tests

✅ 0 Failed, 1009 Passed, 0 Skipped, 20m 29.98s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-04-15 16:27:35

Comparing candidate commit ce58841 in PR branch mario.vidal/impacted_tests with baseline commit 38f62e9 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 947 metrics, 16 unstable metrics.