fix(applicationcomposer): support out of workspace file watching #4877

Problem:
- We found a bug: File watch is not working on template files which out side workspace

Solution:
- use a [complex glob pattern](https://code.visualstudio.com/api/references/vscode-api#RelativePattern) instead of a string as the parameter of [`createFileSystemWatcher` function](https://vscode-api.js.org/modules/vscode.workspace.html#createFileSystemWatcher)

Author: Galaoaoa

.changes/next-release/Bug Fix-de3f475e-93a7-4ba6-8b26-90b655e563ca.json

@@ -0,0 +1,4 @@
+{
+	"type": "Bug Fix",
+	"description": "support template file watching out of workspace for Application Composer"
+}

packages/core/src/applicationcomposer/messageHandlers/addFileWatchMessageHandler.ts

@@ -22,7 +22,7 @@ export async function addFileWatchMessageHandler(request: AddFileWatchRequestMes
         }
         const filePath = context.defaultTemplatePath
         const fileName = context.defaultTemplateName
-        const fileWatch = vscode.workspace.createFileSystemWatcher(filePath)
+        const fileWatch = vscode.workspace.createFileSystemWatcher(new vscode.RelativePattern(filePath, '*'))
         context.disposables.push(fileWatch)
 
         fileWatch.onDidChange(async () => {