Cherry pick fix for native notebook support into release branch (microsoft#15369)

* Fix problem with notebook apis not being used. (microsoft#15366)

* Update changelog

* Remove news file

Author: rchiodo

CHANGELOG.md

@@ -29,6 +29,8 @@
    ([#15232](https://github.com/Microsoft/vscode-python/issues/15232))
 1. Ensure target environment is activated in the terminal when running install scripts.
    ([#15285](https://github.com/Microsoft/vscode-python/issues/15285))
+1. Allow support for using notebook APIs in the VS code stable build.
+   ([#15364](https://github.com/Microsoft/vscode-python/issues/15364))
 
 ### Code Health
 

src/client/common/application/notebook.ts

@@ -85,7 +85,7 @@ export class VSCodeNotebook implements IVSCodeNotebook {
         @inject(IDisposableRegistry) private readonly disposables: IDisposableRegistry,
         @inject(IApplicationEnvironment) readonly env: IApplicationEnvironment,
     ) {
-        if (this.useProposedApi && this.env.channel === 'insiders') {
+        if (this.useProposedApi) {
             this.addEventHandlers();
             this.canUseNotebookApi = true;
         }