Refs: #135553

• web @kimadeline
• web @isidorn

Complexity: 3

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We have enabled offline access in https://insiders.vscode.dev/, which is a core part of PWAs. Test that:

• After using https://insiders.vscode.dev/ for a minute or so, you can go offline, open https://insiders.vscode.dev/ again and basic functionality should still work, especially local file editing. Core, built-in, extensions should work. Marketplace extensions don't.
• When offline, the status bar should turn a red color and there should be a status bar item on the left indicating the offline status.