Do not override kernels info in other notebooks (#9958)

For #9951, #9950, #9949
* Do not override kernels info in other notebooks
* Fixes

Author: DonJayamanne

src/client/datascience/jupyter/liveshare/hostJupyterServer.ts

@@ -158,10 +158,16 @@ export class HostJupyterServer extends LiveShareParticipantHost(JupyterServerBas
         // Otherwise create a new notebook.
 
         // First we need our launch information so we can start a new session (that's what our notebook is really)
-        const launchInfo = await this.waitForConnect();
+        let launchInfo = await this.waitForConnect();
         if (!launchInfo) {
             throw this.getDisposedError();
         }
+        // Create a copy of launch info, cuz we're modifying it here.
+        // This launch info contains the server connection info (that could be shared across other nbs).
+        // However the kernel info is different. The kernel info is stored as a  property of this, hence create a separate instance for each nb.
+        launchInfo = {
+            ...launchInfo
+        };
 
         // Find a kernel that can be used.
         // Do this only if kernel information has been provided in the metadata, else use the default.