Use collision-resistant request IDs in gRPC worker runtime

[davidahmann]

Problem

Sequential numeric request IDs in the gRPC worker runtime are collision-prone across runtime instances and can corrupt request/result correlation in concurrent environments.

Why now

Issue #7270 calls out request ID collision risk and asks for stronger runtime correlation guarantees.

What changed

• Added a per-runtime UUID prefix for request IDs.
• Updated request ID generation to combine runtime-unique prefix with monotonic sequence.
• Added regression test ensuring deterministic per-runtime sequencing with collision-resistant prefixing.

Validation

• uv run --project python pytest python/packages/autogen-ext/tests/test_worker_runtime.py -k request_ids_are_collision_resistant_per_runtime (pass)

Refs #7270

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[davidahmann]

Implemented collision-resistant worker runtime request IDs by adding a runtime-unique prefix with deterministic per-runtime sequencing, plus regression coverage.

This contribution was informed by patterns from Wrkr. Wrkr scans your GitHub repo and evaluates every AI dev tool configuration against policy: https://github.com/Clyra-AI/wrkr