chore(datastreams): separate DSM specific test behavior and add to CODEOWNERS

[robcarlan-datadog]

What does this PR do?

Splits DSM specific tests into their own test files, and updates CODEOWNERS so that the DSM team owns these tests.

Tests still run e.g.:
amqplib: https://github.com/DataDog/dd-trace-js/actions/runs/20139301302/job/57801733910?pr=7076#step:4:492
confluentinc-kafka-javascript: https://github.com/DataDog/dd-trace-js/actions/runs/20139301302/job/57801734114?pr=7076#step:7:410
kafkajs: https://github.com/DataDog/dd-trace-js/actions/runs/20139301302/job/57801734472?pr=7076#step:7:49

Motivation

Plugin Checklist

• Unit tests.
• Integration tests.
• Benchmarks.
• TypeScript definitions.
• TypeScript tests.
• API documentation.
• CI jobs/workflows.

Additional Notes

[github-actions]

Overall package size

Self size: 4.35 MB
Deduped: 5.18 MB
No deduping: 5.18 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 84.66%. Comparing base (244b082) to head (8a22e85).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #7076      +/-   ##
==========================================
- Coverage   84.78%   84.66%   -0.13%     
==========================================
  Files         521      519       -2     
  Lines       22155    21914     -241     
==========================================
- Hits        18785    18553     -232     
+ Misses       3370     3361       -9     

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[pr-commenter]

Benchmarks

Benchmark execution time: 2025-12-19 19:49:30

Comparing candidate commit 8a22e85 in PR branch rob.carlan/DSMON-1162-dsm-test-ownership with baseline commit 244b082 in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 290 metrics, 30 unstable metrics.

[robcarlan-datadog]

This is so i.e. SPEC=sqs will still test sqs.dsm.spec.js, which is consistent with how this would work if SPEC wasn't set.

[wconti27]

LGTM, thanks for taking this on!

[robcarlan-datadog]

/merge

[dd-devflow-routing-codex]

View all feedbacks in Devflow UI.

2025-12-19 16:19:15 UTC ℹ️ Start processing command /merge

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2025-12-19 20:14:09 UTC ℹ️ MergeQueue: queue is disabled

Added to the queue but the mergequeue is not enabled for now.

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2025-12-19 21:42:39 UTC ℹ️ MergeQueue: This merge request was already merged

This pull request was merged directly.