[PF run] Update cwd when additional includes exist (#709)

# Description
When user code uses the files in additional include, pf run will raise
ModuleNotFound error.
Error msg: Failed to load python module from file
'/tmp/tmprzerq2_9/flow/prepare_examples.py', reason: [Errno 2] No such
file or directory: 'fetch_text_content_from_url.py'."

![image](https://github.com/microsoft/promptflow/assets/17938940/ab00d1b8-c406-4b29-b873-e3a515e1f609)


Please add an informative description that covers that changes made by
the pull request and link all relevant issues.

# All Promptflow Contribution checklist:
- [ ] **The pull request does not introduce [breaking changes].**
- [ ] **CHANGELOG is updated for new features, bug fixes or other
significant changes.**
- [ ] **I have read the [contribution guidelines](../CONTRIBUTING.md).**
- [ ] **Create an issue and link to the pull request to get dedicated
review from promptflow team. Learn more: [suggested
workflow](../CONTRIBUTING.md#suggested-workflow).**

## General Guidelines and Best Practices
- [ ] Title of the pull request is clear and informative.
- [ ] There are a small number of commits, each of which have an
informative message. This means that previously merged commits do not
appear in the history of the PR. For more information on cleaning up the
commits in your PR, [see this
page](https://github.com/Azure/azure-powershell/blob/master/documentation/development-docs/cleaning-up-commits.md).

### Testing Guidelines
- [ ] Pull request includes test coverage for the included changes.

src/promptflow/promptflow/_sdk/operations/_flow_operations.py

@@ -26,6 +26,7 @@
 from promptflow._sdk.entities._validation import ValidationResult
 from promptflow._sdk.operations._run_submitter import remove_additional_includes, variant_overwrite_context
 from promptflow._sdk.operations._test_submitter import TestSubmitter
+from promptflow._utils.context_utils import _change_working_dir
 from promptflow.exceptions import UserErrorException
 
 
@@ -289,12 +290,14 @@ def _export_flow_connections(
     ):
         from promptflow.contracts.flow import Flow as ExecutableFlow
 
-        executable = ExecutableFlow.from_yaml(flow_file=Path(flow_dag_path.name), working_dir=flow_dag_path.parent)
+        executable = ExecutableFlow.from_yaml(flow_file=Path(flow_dag_path.name),
+                                              working_dir=flow_dag_path.parent.absolute())
 
-        return self._migrate_connections(
-            connection_names=executable.get_connection_names(),
-            output_dir=output_dir,
-        )
+        with _change_working_dir(flow_dag_path.parent):
+            return self._migrate_connections(
+                connection_names=executable.get_connection_names(),
+                output_dir=output_dir,
+            )
 
     def _build_flow(
         self,

src/promptflow/promptflow/_sdk/operations/_run_submitter.py

@@ -275,7 +275,8 @@ def _run_bulk(self, run: Run, stream=False, **kwargs):
 
     def _submit_bulk_run(self, flow: Flow, run: Run, local_storage: LocalStorageOperations) -> dict:
         run_id = run.name
-        connections = SubmitterHelper.resolve_connections(flow=flow)
+        with _change_working_dir(flow.code):
+            connections = SubmitterHelper.resolve_connections(flow=flow)
         column_mapping = run.column_mapping
         # resolve environment variables
         SubmitterHelper.resolve_environment_variables(environment_variables=run.environment_variables)

src/promptflow/tests/test_configs/flows/web_classification_with_additional_include/prepare_examples.py

@@ -1,6 +1,9 @@
 from pathlib import Path
 from promptflow import tool
 
+# read file from additional includes
+lines = open(r"fetch_text_content_from_url.py", "r").readlines()
+
 
 @tool
 def prepare_examples():