chore(profiling): native test install subdirs (PROF-14200)

[vlad-scherbich]

prev: #19267 | next: #19269

Summary

INSTALL_SUBDIR for py3.15 native tests. Replaces merged #19257.

Test plan

• CI green on this branch
• Stack merges cleanly into the next PR's base branch

Tracker

• Contributes to [3.15] Profiling 3.15 #17817
• Contributes to [Tracker] Python 3.15 integration parity #17809

[datadog-datadog-us1-prod]

🎉 All green!

🧪 All tests passed
❄️ No new flaky tests detected

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: d9bcea5 | Docs | View more details | Give us feedback!}

[cit-pr-commenter-54b7da]

Codeowners resolved as

Resolved from the full PR diff against vlad/315-peripheral-compat using the target branch CODEOWNERS file.
CODEOWNERS team requests not listed below are not required by the current file set.

ddtrace/internal/datadog/profiling/stack/test/CMakeLists.txt            @DataDog/profiling-python

[cit-pr-commenter-54b7da]

Circular import analysis

⚠️ Existing circular imports

There are 3 circular imports that already exist on the base branch and have not been changed by this PR.

ddtrace.llmobs -> ddtrace.llmobs._evaluators -> ddtrace.llmobs._evaluators.format -> ddtrace.llmobs._experiment -> ddtrace.llmobs
ddtrace.errortracking._handled_exceptions.bytecode_injector -> ddtrace.errortracking._handled_exceptions.callbacks -> ddtrace.errortracking._handled_exceptions.collector -> ddtrace.errortracking._handled_exceptions.bytecode_reporting -> ddtrace.errortracking._handled_exceptions.bytecode_injector
ddtrace.appsec._asm_request_context -> ddtrace.appsec._iast._iast_request_context_base -> ddtrace.appsec._iast._iast_env -> ddtrace.appsec._iast.reporter -> ddtrace.appsec._exploit_prevention.stack_traces -> ddtrace.appsec._asm_request_context

[cit-pr-commenter-54b7da]

Dependency direction analysis

⚠️ Existing dependency direction violations

There are 250 dependency direction violations that already exist on the base branch and have not been changed by this PR.

Show existing violations (showing 5 of 250 highest severity)

ddtrace.internal.tracemethods -×-> ddtrace.trace  (internal-core -> product:tracing, score=135)
ddtrace.llmobs._integrations.crewai -×-> ddtrace.trace  (product:llmobs -> product:tracing, score=133)
ddtrace.internal.opentelemetry.span -×-> ddtrace.trace  (product:opentelemetry -> product:tracing, score=133)
ddtrace.llmobs._integrations.langchain -×-> ddtrace.trace  (product:llmobs -> product:tracing, score=133)
ddtrace.llmobs._integrations.langgraph -×-> ddtrace.trace  (product:llmobs -> product:tracing, score=133)

To see all violations, download the layers-base.json and layers-pr.json artifacts from this CI job and run:

uv run --script scripts/import-analysis/layers.py compare layers-base.json layers-pr.json

[vlad-scherbich]

Absorbed into consolidated profiling stack — see survivor PR in consolidation comment on the stack.

[vlad-scherbich]

Closed: INSTALL_SUBDIR / native test install work merged into #19269 (native ABI + install subdirs).