upgrades: Add button to test dist-upgrade in development mode
I think this will help with automating dist-upgrade tests, and also may encourage more developers to test this feature.
Note that there is no change for normal users (non-development mode).
Tests:
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In non-development mode, button does not appear.
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On testing system, button does not appear.
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On stable system in development mode, the button appears.
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Pressing the button starts a dist-upgrade.
Signed-off-by: James Valleroy jvalleroy@mailbox.org