test(django): update some stale skipped tests in the django suite

[emmettbutler]

This change removes the @flaky markers from some django tests and updates expectations that had become stale.

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:

tests/contrib/django/test_django.py                                     @DataDog/apm-core-python @DataDog/apm-idm-python
tests/contrib/django/test_django_snapshots.py                           @DataDog/apm-core-python @DataDog/apm-idm-python
tests/snapshots/tests.contrib.django.test_django_snapshots.test_psycopg2_query_default.json  @DataDog/apm-python
tests/snapshots/tests.contrib.django.test_django_snapshots.test_psycopg3_query_default.json  @DataDog/apm-python
tests/snapshots/tests.contrib.django.test_django_snapshots.test_urlpatterns_include.json  @DataDog/apm-python

[erikayasuda]

@emmettbutler It's failing the style check because the flaky import is still there but unused

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-02-21 19:33:35

Comparing candidate commit 8f8021d in PR branch emmett.butler/django-stale with baseline commit 7011d3c in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 418 metrics, 2 unstable metrics.