[pipeline] keep setup.py for now (#42353)

* temp config

* update

* update

Author: msyyc

swagger_to_sdk_config_autorest.json

@@ -8,7 +8,8 @@
       "version-tolerant": false,
       "include-x-ms-examples-original-file": true,
       "generate-sample": true,
-      "generate-test": true
+      "generate-test": true,
+      "keep-setup-py": true
     },
     "advanced_options": {
       "create_sdk_pull_requests": true,

tools/azure-sdk-tools/packaging_tools/generate_utils.py

@@ -2,6 +2,7 @@
 import logging
 import os
 import re
+
 try:
     # py 311 adds this library natively
     import tomllib as toml
@@ -461,11 +462,13 @@ def gen_typespec(
             tsp_dir = (Path(spec_folder) / typespec_relative_path).resolve()
             repo_url = rest_repo_url.replace("https://github.com/", "")
             tspconfig = tsp_dir / "tspconfig.yaml"
-            if api_version and tspconfig.exists():
+            if tspconfig.exists():
                 with open(tspconfig, "r") as file_in:
                     content = yaml.safe_load(file_in)
                     if content.get("options", {}).get("@azure-tools/typespec-python"):
-                        content["options"]["@azure-tools/typespec-python"]["api-version"] = api_version
+                        content["options"]["@azure-tools/typespec-python"]["keep-setup-py"] = True
+                        if api_version:
+                            content["options"]["@azure-tools/typespec-python"]["api-version"] = api_version
                 with open(tspconfig, "w") as file_out:
                     yaml.dump(content, file_out)
             cmd = f"tsp-client init --tsp-config {tsp_dir} --local-spec-repo {tsp_dir} --commit {head_sha} --repo {repo_url}"