Werk #14804: Deprecate cmk backup and cmk restore

Component	Core & setup
Title	Deprecate cmk backup and cmk restore
Date	Sep 19, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0p13 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p29 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

'cmk backup' and 'cmk restore' will be removed in checkmk 2.2. Please use 'omd backup' instead.

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