chore(django): Use iscoroutinefunction shim in patch_views()

[alexander-alderman-webb]

Description

Re-use the existing shim in django.asgi that vendors asgiref.sync.iscoroutinefunction().

The views.py and asgi.py files were split to keep Python 2 compatibility in #851.

As we no longer support Python 2, we can unconditionally import asgi.py in views.py.

Issues

Closes #4900

Reminders

• Please add tests to validate your changes, and lint your code using uv run ruff.
• Add GH Issue ID & Linear ID (if applicable)
• PR title should use conventional commit style (feat:, fix:, ref:, meta:)
• For external contributors: CONTRIBUTING.md, Sentry SDK development docs, Discord community

[github-actions]

Codecov Results 📊

✅ 95563 passed | ⏭️ 6239 skipped | Total: 101802 | Pass Rate: 93.87% | Execution Time: 341m 16s

📊 Comparison with Base Branch

Metric	Change
Total Tests	—
Passed Tests	📈 +1
Failed Tests	📉 -1
Skipped Tests	—

➖ Removed Tests (1)

View removed tests

• test_continuous_profiler_auto_start_and_stop_sampled_span_streaming[experiment-thread]
  • File: tests.profiler.test_continuous_profiler

All tests are passing successfully.

✅ Patch coverage is 83.33%. Project has 2504 uncovered lines.
✅ Project coverage is 89.91%. Comparing base (base) to head (head).

Files with missing lines (1)

File	Patch %	Lines
sentry_sdk/integrations/django/views.py	83.33%	⚠️ 1 Missing and 1 partials

Coverage diff

@@            Coverage Diff             @@
##          main       #PR       +/-##
==========================================
+ Coverage    89.90%    89.91%    +0.01%
==========================================
  Files          193       193         —
  Lines        24834     24825        -9
  Branches      8912      8912         —
==========================================
+ Hits         22326     22321        -5
- Misses        2508      2504        -4
- Partials      1415      1414        -1

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[sentrivana]

Nice! Small suggestion