ci: replace poetry with uv

[leandrodamascena]

Issue number: closes #5624

Summary

Migrate development, CI, builds, and layer tooling from Poetry to uv, with standard project metadata and Hatchling builds. Existing dependency constraints and extras are preserved. Locked versions are retained except for datadog-lambda (8.121.0 → 8.122.0) and ddtrace (3.19.6 → 4.8.2), updated together to resolve GHSA-mw54-j2v2-42hr; the old Datadog Lambda version required ddtrace<4. Contributors install uv and run make dev.

Release and pre-release workflows validate the version and use sed to update pyproject.toml, shared/version.py, and uv.lock before sealing the source. The automatic version PR is preserved and includes the lockfile. The bump installs no dependencies and leaves their locked versions unchanged. Checks stop the workflow before sealing if a replacement misses its field; only the project version is changed in pyproject.toml.

Nox uses uv environments with explicit test dependencies, including JSON Schema validation previously installed transitively by Poetry. The E2E layer builder retains its pip commands and platform selection, with pip now declared as a development dependency. Existing coverage exclusions also apply when subprocesses change their working directory.

Validation

• Full test suite on Python 3.10 and 3.14; all 12 Nox sessions; performance tests.
• Datadog integration tests with the exact locked versions on Python 3.10 and 3.14; both environments pass dependency compatibility checks.
• 69 release scenarios on Python 3.10 and 3.14 execute the workflow shell commands: version transitions, retries, invalid inputs, changed file formats, unrelated version fields, archive integrity, matching wheel/sdist versions, and a Git tag pushed to a temporary local repository.
• Ruff, mypy, ty, Bandit, complexity checks, actionlint, Markdown lint, and docs build.
• Wheel package files are byte-identical to the develop build; all 12 extras and default requirements are equivalent. Built and installed the sdist in a clean Python 3.10 environment.
• Four layer helper tests passed locally. The Docker-based layer constructor matrix covers Python 3.10–3.14 on x86_64 and ARM64, replacing the obsolete Python 3.9 cases. Dependency resolution for the added Python 3.14 cases passed on both architectures; complete Docker builds run in CI.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.80%. Comparing base (ed6535d) to head (d6136b5).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #7910   +/-   ##
========================================
  Coverage    96.80%   96.80%           
========================================
  Files          310      310           
  Lines        15594    15594           
  Branches      1361     1361           
========================================
  Hits         15096    15096           
  Misses         362      362           
  Partials       136      136           

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud