fix(integrations): asyncio iscoroutinefunction warning

[cooperoptigrid]

Description

Uses Django ASGI function patching to use inspect.iscoroutinefunction instead of asyncio.iscoroutinefunction to avoid depreaction warning in 3.14.
Rolled out to all uses of asyncio.iscoroutinefunction in the integrations package.

Repro in issue doesn't raise warning with these changes. tox linters and test pass on py3.12, py3.14.

Issues

• resolves: #6085

Reminders

• Please add tests to validate your changes, and lint your code using tox -e linters.
• 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

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Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

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New Features ✨

• (ci) Cancel in-progress PR workflows on new commit push by joshuarli in #5994
• Add db.driver.name spans to database integrations by ericapisani in #6082

Bug Fixes 🐛

• (google_genai) Redact binary data in inline_data and fix multi-part message extraction by ericapisani in #5977
• (grpc) Add isolation_scope to async server interceptor by robinvd in #5940

• (integrations) Asyncio iscoroutinefunction warning by cooperoptigrid in #6090

• (profiler) Stop nulling buffer on teardown by ericapisani in #6075

Internal Changes 🔧

• (celery) Remove unused NoOpMgr from utils by sentrivana in #6078
• (ci) Update outdated pinned action version comments by JoshuaMoelans in #6088
• (pydantic-ai) Remove dead Model.request patch by alexander-alderman-webb in #5956
• (tests) Replace deprecated enable_tracingwith traces_sample_rate by sentrivana in #6077
• Set explicit base-branch for codecov action by ericapisani in #5992

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[alexander-alderman-webb]

inspect.iscoroutinefunction is not a drop-in replacement for asyncio.iscoroutinefunction on old Python versions (which we support).

There's some details in this blog post: https://lucumr.pocoo.org/2016/10/30/i-dont-understand-asyncio/

There's an existing PR containing some advice on approaching the migration. Generally mirroring the respective library's version checks would be great (not just copying Django's specific handling across the whole SDK)!

#4915

[alexander-alderman-webb]

_markcoroutinefunction is not used outside of the Django integration, so please leave it there.

[cooperoptigrid]

I've simply moved it back for this PR. Still digesting the other comment

[cooperoptigrid]

#4915

@alexander-alderman-webb Do you want me to take those changes from that PR and add those patches here and address any outstanding comments? Or were there fundamental issues blocking its merge, and I should take a different approach entirely.