Werk #13087: Remove ad hoc restrictions in the generic check helper protocol.

Component	Core & setup
Title	Remove ad hoc restrictions in the generic check helper protocol.
Date	Oct 6, 2021
Level	Major Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Pro, Checkmk Ultimate MT 2.0.0p13 Checkmk Pro, Checkmk Ultimate MT 1.6.0p28 Checkmk Pro, Checkmk Ultimate MT

This enables, among other things, the use of very long command lines for active checks.

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