fix(aap): track user default arguments must not generate security event

[christophe-papazian]

Ensure track_user to not generate additional security events when used with expected metadata (name, email, scope or role).

Also:

• update (and fix) related unit tests

APPSEC-58040

Checklist

• PR author has checked that all the criteria below are met
• The PR description includes an overview of the change
• The PR description articulates the motivation for the change
• The change includes tests OR the PR description describes a testing strategy
• The PR description notes risks associated with the change, if any
• Newly-added code is easy to change
• The change follows the library release note guidelines
• The change includes or references documentation updates if necessary
• Backport labels are set (if applicable)

Reviewer Checklist

• Reviewer has checked that all the criteria below are met
• Title is accurate
• All changes are related to the pull request's stated goal
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Newly-added code is easy to change
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions]

CODEOWNERS have been resolved as:

releasenotes/notes/ato_sdk2_track_user_fix_no_keep-b6b5206a81da6b36.yaml  @DataDog/apm-python
ddtrace/appsec/track_user_sdk.py                                        @DataDog/asm-python
tests/appsec/appsec/test_appsec_trace_utils.py                          @DataDog/asm-python

[github-actions]

Bootstrap import analysis

Comparison of import times between this PR and base.

Summary

The average import time from this PR is: 276 ± 2 ms.

The average import time from base is: 278 ± 2 ms.

The import time difference between this PR and base is: -2.1 ± 0.1 ms.

Import time breakdown

The following import paths have shrunk:

ddtrace.auto 2.013 ms (0.73%)

ddtrace.bootstrap.sitecustomize 1.337 ms (0.48%)

ddtrace.bootstrap.preload 1.337 ms (0.48%)

ddtrace.internal.remoteconfig.client 0.644 ms (0.23%)

ddtrace 0.676 ms (0.25%)

ddtrace.internal._unpatched 0.030 ms (0.01%)

json 0.030 ms (0.01%)

json.decoder 0.030 ms (0.01%)

re 0.030 ms (0.01%)

enum 0.030 ms (0.01%)

types 0.030 ms (0.01%)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-06-23 14:30:49

Comparing candidate commit 51e1edc in PR branch christophe-papazian/track_user_metadata_as_setuser with baseline commit 6fae86b in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 561 metrics, 3 unstable metrics.