Add setup exporter logic as creating executor (#2480)

# Description
Setting up exporter as creating executor.
Then we could skip setting up it in many places.
Will use e2e test to cover this scenario.
# All Promptflow Contribution checklist:
- [X] **The pull request does not introduce [breaking changes].**
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significant changes.**
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## General Guidelines and Best Practices
- [X] Title of the pull request is clear and informative.
- [X] There are a small number of commits, each of which have an
informative message. This means that previously merged commits do not
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### Testing Guidelines
- [ ] Pull request includes test coverage for the included changes.

Co-authored-by: robbenwang <[email protected]>

src/promptflow-core/promptflow/executor/_line_execution_process_pool.py

@@ -696,11 +696,6 @@ def _process_wrapper(
         bulk_logger.info("Current thread is not main thread, skip signal handler registration in batch process pool.")
     OperationContext.get_instance().update(operation_contexts_dict)  # Update the operation context for the new process.
 
-    # set up OpenTelemetry exporter in process who executes the line
-    from promptflow.tracing._start_trace import setup_exporter_from_environ
-
-    setup_exporter_from_environ()
-
     _exec_line_for_queue(
         executor_creation_func,
         output_dir,

src/promptflow-core/promptflow/executor/flow_executor.py

@@ -62,6 +62,7 @@
 from promptflow.storage._run_storage import DefaultRunStorage
 from promptflow.tracing._integrations._openai_injector import inject_openai_api
 from promptflow.tracing._operation_context import OperationContext
+from promptflow.tracing._start_trace import setup_exporter_from_environ
 from promptflow.tracing._trace import (
     enrich_span_with_context,
     enrich_span_with_input,
@@ -199,6 +200,7 @@ def create(
         :return: A new instance of FlowExecutor.
         :rtype: ~promptflow.executor.flow_executor.FlowExecutor
         """
+        setup_exporter_from_environ()
         if is_flex_flow(file_path=flow_file, working_dir=working_dir):
             from ._script_executor import ScriptExecutor