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NetworkManager: Do not remove devices when their active connection changes

Arjen Hiemstra requested to merge work/ahiemstra/nm_device_remove into master

In certain cases, NetworkManager can go on a rampage sending active connection change signals in very rapid succession. This results in memory usage ballooning because lambda connections can not be unique.

Rather than destroying and recreating the NetworkManagerDevice objects on active connection change, this changes things so that we only remove them from the SensorContainer but keep the actual objects around. This allows NetworkManagerDevice to track its active connection state, removing the need for constant reconnects.

BUG: 430003

Additionally, this contains a fix for a crash that I encountered with AggregateSensor.

Edited by Arjen Hiemstra

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