Test: Windows background updates & update service rewriting

[joaomoreno]

Tests #41676

Complexity: 3

• Windows @ramya-rao-a
• macOS @roblourens
• Linux @rebornix

Windows

We now support Windows background updates. The setup package needs a bit of testing:

• Installing VS Code should be just as before.
• The setup package should not start installing if there is an instance of Code already running.
• The 32 bit setup should complain if 64 bit Code is already installed.
• The update.enableWindowsBackgroundUpdates setting controls whether background updates are enabled. If disabled, update should work as before. If enabled:
  • An update notification should prompt the user to Install Update... instead of Restart Now...
  • There should be a notification window informing the user that the update is being installed in the background.
  • When ready, there should be a badge notification in the gear icon with the Restart Now... action. When clicked, Code should quit, a modal progress window should come up while the update is finalized and then Code should come right back up.
  • If you quit Code before the update is ready, the update should still finish in the background, no progress window should come up and Code shouldn't start up when done.

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Windows, Linux, macOS

Additionally, the whole update service was completely rewritten, so a bit of testing on other platforms is also necessary.

Shortly after startup, an automatic check for updates should take place

• If there is no available update, nothing should happen.
• Otherwise, a number notification should appear in the gear icon.

Manual update checks behave a bit differently:

• If there is no available update, a notification should popup up mentioning that there are no available updates.
• Otherwise, the same should happen: a number notification should appear in the gear icon.

When there is an available update, the experience differs from platform:

• On Windows, the action should change to a disabled Downloading Update... action, while the update downloads. When ready, there should be a Restart to Update... action which applies the update.
• On macOS, the action should change to a disabled Downloading Update... action, while the update downloads. When ready, there should be a Restart to Update... action which applies the update.
• On Linux, there should be a Download Now link, which should open a browser to download the new version. The link should disappear after clicking, in order to check for further updates.