fix: Change context indent to handle RPC exception correctly when calling create kernel

[fregataa]

ai.backend.manager.agent_cache.AgentRPCCache.rpc_context() provides a context with a RPC peer.
It raises a RPCUserError if the RPC invokes error.
We use ai.backend.manager.exceptions.convert_to_status_data() to parse AgentError or MultiAgentError to a readable dictionary but it does not work properly since the function gets only RPCUserError.

Checklist: (if applicable)

• Milestone metadata specifying the target backport version
• API server-client counterparts (e.g., manager API -> client SDK)

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[fregataa]

• enhance: produce DoPrepareEvent after finishing scheduling in all scaling groups #2181
• feat: agent resource sync API #2180
• fix: Change context indent to handle RPC exception correctly when calling create kernel #2437 👈
• main

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