changed workflow and step span name (#88)

Author: wrisa

util/opentelemetry-util-genai/src/opentelemetry/util/genai/emitters/span.py

@@ -380,7 +380,7 @@ def on_error(
     # ---- Workflow lifecycle ----------------------------------------------
     def _start_workflow(self, workflow: Workflow) -> None:
         """Start a workflow span."""
-        span_name = f"gen_ai.workflow {workflow.name}"
+        span_name = f"workflow {workflow.name}"
         parent_span = getattr(workflow, "parent_span", None)
         parent_ctx = (
             trace.set_span_in_context(parent_span)
@@ -595,7 +595,7 @@ def _error_agent(
     # ---- Step lifecycle --------------------------------------------------
     def _start_step(self, step: Step) -> None:
         """Start a step span."""
-        span_name = f"gen_ai.step {step.name}"
+        span_name = f"step_execution {step.name}"
         parent_span = getattr(step, "parent_span", None)
         parent_ctx = (
             trace.set_span_in_context(parent_span)