Werk #15771: discovery: remove vanished labels on 'Accept all'

Component	Checks & agents
Title	discovery: remove vanished labels on 'Accept all'
Date	Aug 14, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.2.0p8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p33 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Vanished labels weren't beeing removed after clicking 'Accept all' in the discovery page. There was no way to remove vanished labels from the host using the UI.

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