chore: Set the default of attach_stacktrace to True

[sentrivana]

Closes https://linear.app/getsentry/issue/PY-2779/change-the-default-of-attach-stacktrace-to-true-in-new-major

[linear-code]

PY-2779

[github-actions]

Codecov Results 📊

✅ 64210 passed | ❌ 3 failed | ⏭️ 3291 skipped | Total: 67504 | Pass Rate: 95.12% | Execution Time: 206m 6s

📊 Comparison with Base Branch

Metric	Change
Total Tests	📉 -67948
Passed Tests	📉 -64111
Failed Tests	📈 +3
Skipped Tests	📉 -3840

➕ New Tests (3)

View new tests

• test_cache_spans_decorator
  • File: tests.integrations.django.test_cache_module
  • Status: ❌ Failing
• test_cache_spans_decorator
  • File: tests.integrations.django.test_cache_module
  • Status: ❌ Failing
• test_cache_spans_decorator
  • File: tests.integrations.django.test_cache_module
  • Status: ❌ Failing

❌ Failed Tests

test_cache_spans_decorator

File: tests.integrations.django.test_cache_module
Suite: py3.11-django-v4.2.30
Error: tests/integrations/django/test_cache_module.py:276: in test_cache_spans_decorator assert not spans[0]["attributes"]["cache.hit"] E assert not True

Stack Trace

tests/integrations/django/test_cache_module.py:276: in test_cache_spans_decorator
    assert not spans[0]["attributes"]["cache.hit"]
E   assert not True

test_cache_spans_decorator

File: tests.integrations.django.test_cache_module
Suite: py3.12-django-v4.2.30
Error: tests/integrations/django/test_cache_module.py:276: in test_cache_spans_decorator assert not spans[0]["attributes"]["cache.hit"] E assert not True

Stack Trace

tests/integrations/django/test_cache_module.py:276: in test_cache_spans_decorator
    assert not spans[0]["attributes"]["cache.hit"]
E   assert not True

test_cache_spans_decorator

File: tests.integrations.django.test_cache_module
Suite: py3.14-django-v6.1
Error: tests/integrations/django/test_cache_module.py:276: in test_cache_spans_decorator assert not spans[0]["attributes"]["cache.hit"] E assert not True

Stack Trace

tests/integrations/django/test_cache_module.py:276: in test_cache_spans_decorator
    assert not spans[0]["attributes"]["cache.hit"]
E   assert not True

✅ Patch coverage is 100.00%. Project has 2268 uncovered lines.
❌ Project coverage is 89.46%. Comparing base (660a4b3) to head (791847c).

Coverage diff

@@            Coverage Diff             @@
##        master       #PR       +/-##
==========================================
- Coverage    90.18%    89.46%    -0.72%
==========================================
  Files          193       180       -13
  Lines        25768     21513     -4255
  Branches      9532      7814     -1718
==========================================
+ Hits         23236     19245     -3991
- Misses        2532      2268      -264
- Partials      1432      1227      -205

---

Generated by Codecov Action