Python: Use more meaningful names in observability traces

[SuperKenVery]

Currently, all executors in a workflow appear the same in a trace:

This makes the trace unreadable, and the generated graph totally meaningless.

I suggest that we use something more meaningful, like the executor_id, when creating spans.

agent-framework/python/packages/core/agent_framework/observability.py

Lines 1628 to 1638 in ed53ba1

	return workflow_tracer().start_as_current_span(
	OtelAttr.EXECUTOR_PROCESS_SPAN,
	kind=trace.SpanKind.INTERNAL,
	attributes={
	OtelAttr.EXECUTOR_ID: executor_id,
	OtelAttr.EXECUTOR_TYPE: executor_type,
	OtelAttr.MESSAGE_TYPE: message_type,
	OtelAttr.MESSAGE_PAYLOAD_TYPE: payload_type,
	},
	links=links,
	)

Here, the span name is hardcoded as OtelAttr.EXECUTOR_PROCESS_SPAN, which is an alias of "executor.process". I think changing it to executor_id could produce much more meaningful traces. The same goes for edge group.