Replace all_messages_events with pydantic_ai.all_messages for InstrumentationSettings(version=2)
#2658
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Part of #2348
Internal discussion: https://pydantic.slack.com/archives/C081LUCJ4KX/p1755869953769009
gen_ai.input/output.messagesdoesn't really work for agent spans, it's not clear what's input/output. There's some discussion in open-telemetry/semantic-conventions#2632.This ensures one consistent data shape for both agent spans and LLM request spans.