agent: add attributes map to AgentDispatch and Job (#1629)

* agent: add simulation flag to AgentDispatch and Job

Threads a new bool simulation field from CreateAgentDispatchRequest /
RoomAgentDispatch through AgentDispatch and onto Job so agent workers
can know they are being dispatched to a simulated room.

* generated protobuf

* agent: replace simulation bool with attributes map

Swap the bool simulation field for a map<string, string> attributes
field on CreateAgentDispatchRequest, RoomAgentDispatch, AgentDispatch,
and Job. The map is marked SENSITIVITY_PII so logs redact it.

* mark job metadata as pii

* tidy

* generated protobuf

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Co-authored-by: github-actions <41898282+github-actions[bot]@users.noreply.github.com>

Author: paulwe