fix(asyncio): Add task_isolation setting for AsyncioIntegration (#5371)

[harryautomazione]

Problem

Currently, AsyncioIntegration wraps every asyncio task in a new isolation_scope(). While this is great for isolating background tasks, it prevents scope data (like tags set via sentry_sdk.set_tag()) inside async endpoints from propagating back to the parent middleware transaction (e.g. in FastAPI/Starlette).

Solution

This PR adds a task_isolation: bool parameter (default True) to AsyncioIntegration.
Setting task_isolation=False disables the automatic isolation_scope() for tasks, allowing tags written inside endpoints to correctly attach to the outer HTTP transaction trace.

Fixes #5371

Verification

Verified with a reproduction script that with task_isolation=False, tags set inside local endpoint asyncio tasks correctly surface on the captured HTTP response transaction.

[github-actions]

Semver Impact of This PR

🟢 Patch (bug fixes)

📋 Changelog Preview

This is how your changes will appear in the changelog.
Entries from this PR are highlighted with a left border (blockquote style).

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New Features ✨

• (asgi) Add option to disable suppressing chained exceptions by alexander-alderman-webb in #5714
• (logging) Separate ignore lists for events/breadcrumbs and sentry logs by sl0thentr0py in #5698

Bug Fixes 🐛

Anthropic

• Set exception info on streaming span when applicable by alexander-alderman-webb in #5683
• Patch AsyncStream.close() and AsyncMessageStream.close() to finish spans by alexander-alderman-webb in #5675
• Patch Stream.close() and MessageStream.close() to finish spans by alexander-alderman-webb in #5674

Other

• (asyncio) Add task_isolation setting for AsyncioIntegration (AsyncIOIntegration cause misbehavior in transactions created from auto-integrations #5371) by harryautomazione in #5734

Documentation 📚

• Add note on AI PRs to CONTRIBUTING.md by sentrivana in #5696

Internal Changes 🔧

• Add -latest alias for each integration test suite by sentrivana in #5706
• Use date-based branch names for toxgen PRs by sentrivana in #5704
• 🤖 Update test matrix with new releases (03/19) by github-actions in #5703
• Add client report tests for span streaming by sentrivana in #5677

Other

• Update CHANGELOG.md by sentrivana in #5685

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