DUP: do not generate redundant disconnection triggers #1015
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What this PR does / why we need it:
In some corner cases, e.g. deletion of a disconnected device, Astarte would generate a disconnection trigger even if
the device is already disconnected.
Avoid doing so by checking the device connection state before generating a trigger.
Which issue(s) this PR fixes:
Fixes #1014
Special notes for your reviewer:
Does this PR introduce a user-facing change?
Additional documentation e.g. usage docs, diagrams, etc.: