Do not dispose message handler when cell completes

package.json

@@ -2315,7 +2315,6 @@
         "@vscode/test-electron": "^2.1.5",
         "@vscode/test-web": "^0.0.29",
         "acorn": "^6.4.1",
-        "await-lock": "^2.2.2",
         "babel-polyfill": "^6.26.0",
         "bufferutil": "^4.0.6",
         "chai": "^4.3.0",

src/kernels/execution/cellExecution.ts

@@ -210,7 +210,6 @@ export class CellExecution implements IDisposable {
     public dispose() {
         traceCellMessage(this.cell, 'Execution disposed');
         disposeAllDisposables(this.disposables);
-        this.cellExecutionHandler?.dispose();
     }
     private completedWithErrors(error: Partial<Error>) {
         traceWarning(`Cell completed with errors`, error);

src/notebooks/controllers/vscodeNotebookController.ts

@@ -89,7 +89,6 @@ import { initializeInteractiveOrNotebookTelemetryBasedOnUserAction } from '../..
 import { NotebookCellLanguageService } from '../languages/cellLanguageService';
 import { IDataScienceErrorHandler } from '../../kernels/errors/types';
 import { IJupyterServerUriStorage } from '../../kernels/jupyter/types';
-import AwaitLock from 'await-lock';
 
 /**
  * Our implementation of the VSCode Notebook Controller. Called by VS code to execute cells in a notebook. Also displayed
@@ -109,7 +108,6 @@ export class VSCodeNotebookController implements Disposable, IVSCodeNotebookCont
     private readonly disposables: IDisposable[] = [];
     private notebookKernels = new WeakMap<NotebookDocument, IKernel>();
     public readonly controller: NotebookController;
-    private lock = new AwaitLock();
     /**
      * Used purely for testing purposes.
      */
@@ -297,11 +295,7 @@ export class VSCodeNotebookController implements Disposable, IVSCodeNotebookCont
         }
         await initializeInteractiveOrNotebookTelemetryBasedOnUserAction(notebook.uri, this.connection);
         // Notebook is trusted. Continue to execute cells
-        await Promise.all(cells.map(async (cell) => {
-            await this.lock.acquireAsync();
-            await this.executeCell(notebook, cell);
-            this.lock.release();
-        }));
+        await Promise.all(cells.map((cell) => this.executeCell(notebook, cell)));
     }
     private warnWhenUsingOutdatedPython() {
         const pyVersion = this.kernelConnection.interpreter?.version;