Cannot create a new file if the preferences widget is opened.

Fixes: #7067 , #7253

Initially we were unable to create a new file or folder while the user preferences was open.

The user-preferences has the file scheme set as `user-storage` and we did not fall back to the workspace root URI and instead were getting the URI from 'user_storage:settings.json'.
With this approach, we create files at certain directories and if a directory doesn't have the scheme set to 'file' it will fallback to the workspace root uri.

Signed-off-by: Muhammad Anas Shahid <muhammad.shahid@ericsson.com>

packages/workspace/src/browser/workspace-commands.ts

@@ -464,8 +464,8 @@ export class WorkspaceRootUriAwareCommandHandler extends UriAwareCommandHandler<
     // eslint-disable-next-line @typescript-eslint/no-explicit-any
     protected getUri(...args: any[]): URI | undefined {
         const uri = super.getUri(...args);
-        // If the URI is available, return it immediately.
-        if (uri) {
+        // Return the `uri` immediately if the resource exists in any of the workspace roots and is of `file` scheme.
+        if (uri && uri.scheme === 'file' && this.workspaceService.getWorkspaceRootUri(uri)) {
             return uri;
         }
         // Return the first root if available.