Fix notebook table rendering with multiple code cells (#12363)

* create unique query runner for each cell

* use cellUri instead of cellId to identify runner

* disconnect each query runner connection

* remove queryrunners size check

src/sql/azdata.d.ts

@@ -4902,6 +4902,8 @@ declare module 'azdata' {
 			 *
 			 * @param disposeOnDone - Whether to dispose of the future when done.
 			 *
+			 * @param cellId - Cell id (used by queryRunner)
+			 *
 			 * @returns A kernel future.
 			 *
 			 * #### Notes
@@ -4916,7 +4918,7 @@ declare module 'azdata' {
 			 *
 			 * **See also:** [[IExecuteReply]]
 			 */
-			requestExecute(content: IExecuteRequest, disposeOnDone?: boolean): IFuture;
+			requestExecute(content: IExecuteRequest, disposeOnDone?: boolean, cellUri?: string): IFuture;
 
 			/**
 			 * Send a `complete_request` message.