Isolate async gRPC server scope per request

[itsviseph]

Summary

Fixes #5894 by creating an isolation_scope() for each async gRPC unary-unary request, matching the sync interceptor and other request-oriented async integrations.

Without per-request isolation, scope state can leak between requests in the async gRPC server interceptor. That means request-local extras, tags, breadcrumbs, and similar scope data can bleed into later requests handled by the same process.

Changes

• wrap the async unary-unary gRPC server handler in sentry_sdk.isolation_scope()
• add a regression test that makes two back-to-back async gRPC requests and verifies request-specific scope extras do not leak across them

Verification

Ran:

• python -m pytest tests/integrations/grpc/test_grpc_aio.py -q

This async gRPC test file passed locally.

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[github-actions]

Semver Impact of This PR

⚪ None (no version bump detected)

📋 Changelog Preview

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New Features ✨

• (ai) Redact base64 data URLs in image_url content blocks by ericapisani in #5953
• (integrations) Instrument pyreqwest tracing by servusdei2018 in #5682

Bug Fixes 🐛

Anthropic

• Capture exceptions for stream() calls by alexander-alderman-webb in #5950
• Stop setting transaction status when child span fails by alexander-alderman-webb in #5717
• Only finish relevant spans in .create() patches by alexander-alderman-webb in #5716

Other

• (wsgi) Respect HTTP_X_FORWARDED_PROTO in request.url construction by sl0thentr0py in #5963

Internal Changes 🔧

• (anthropic) Separate sync and async .create() patches by alexander-alderman-webb in #5715
• (openai) Split token counting by API for easier deprecation by ericapisani in #5930
• (opentelemetry) Ignore mypy error by alexander-alderman-webb in #5927
• Fix license metadata in setup.py by sl0thentr0py in #5934
• Update validate-pr workflow by stephanie-anderson in #5931

Other

• Isolate async gRPC server scope per request by itsviseph in #5966

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