fix logic to extract swagger file (Azure#37512)

Author: msyyc

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

@@ -152,7 +152,7 @@ def get_related_swagger(readme_content: List[str], tag: str) -> List[str]:
             while idx < len(readme_content):
                 if "```" in readme_content[idx]:
                     break
-                if ".json" in readme_content[idx]:
+                if ".json" in readme_content[idx] and "Microsoft." in readme_content[idx]:
                     result.append(readme_content[idx].strip("\n -"))
                 idx += 1
             break