Removed unused patches, added README change, updated sagemaker-extension.diff

Author: aws-spenceng

patched-vscode/extensions/sagemaker-extension/README.md

@@ -1,3 +1,5 @@
 # Sagemaker Extension
 
-Sagemaker extension managed by Sagemaker team
+The SageMaker Extension utilizes the web browser's local cookies to determine the operational status. This extension remains active continuously.
+
+Session Management: The extension monitors the SageMaker cookie to ensure seamless session continuity. It proactively alerts users to sign in again before the session expires, enhancing the user experience by preventing unexpected session interruptions.