Test: drop local files and folders into vscode.dev

[bpasero]

Refs: #141935

• web @digitarald
• web @dbaeumer
• web @joaomoreno

Complexity: 2

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Note please use Google Chrome or Microsoft Edge. This feature needs local file system access.

• do this testing on https://insiders.vscode.dev/
• drop a local folder into the editor area and verify you can browse its contents directly
• drop a local file into the editor area and verify it opens as the file on disk and you can save changes back to the file
• drop a local folder into the empty explorer and verify you can browse its contents directly
• drop a local folder into the empty space after the last entry of the explorer and verify you get a dialog asking what to do with the folder and it works as advertised