[APPSEC-69800] Stop expecting unused and sensitive _dd.appsec.usr tags

[florentinl]

Motivation

APPSEC-69800 removes system-tests expectations for sensitive user tags in the _dd.appsec namespace. The library follow-up work can remove _dd.appsec.usr.id and _dd.appsec.usr.login without these tests requiring those tags to stay present.

Changes

• Removed _dd.appsec.usr.id assertions from automated user tracking and V3 login event tests.
• Removed _dd.appsec.usr.login assertions from V3 login event tests.
• Updated standalone automated user-event checks and smoke validation to rely on public appsec.events.users.*.usr.login tags instead of _dd.appsec.usr.login.

Testing

Workflow

1. ⚠️ Create your PR as draft ⚠️
2. Work on you PR until the CI passes
3. Mark it as ready for review
   • Test logic is modified? -> Get a review from RFC owner.
   • Framework is modified, or non obvious usage of it -> get a review from R&P team

🚀 Once your PR is reviewed and the CI green, you can merge it!

🛟 #apm-shared-testing 🛟

Reviewer checklist

• Anything but tests/ or manifests/ is modified ? I have the approval from R&P team
• A docker base image is modified?
  • the relevant build-XXX-image label is present
• A scenario is added, removed or renamed?
  • Get a review from R&P team

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Bits Code status: ✅ Done

CI Auto-fix: Disabled | Enable

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CODEOWNERS have been resolved as:

tests/appsec/smoke_tests/utils.py                                       @DataDog/asm-libraries @DataDog/system-tests-core
tests/appsec/test_asm_standalone.py                                     @DataDog/asm-libraries @DataDog/system-tests-core
tests/appsec/test_automated_login_events.py                             @DataDog/asm-libraries @DataDog/system-tests-core
tests/appsec/test_automated_user_and_session_tracking.py                @DataDog/asm-libraries @DataDog/system-tests-core