Werk #14803: Remove cmk backup

Component	Core & setup
Title	Remove cmk backup
Date	Sep 16, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Incompatible - Manual interaction might be required
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

The "cmk backup" command has been removed. Use "omd backup" instead.

"cmk backup" only did an incomplete back up and did not guarantee a sucessful restore.

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