Werk #12209: API: modification of show all host tags endpoint

Component	Core & setup
Title	API: modification of show all host tags endpoint
Date	Feb 25, 2021
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b8 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The endpoint show all host tags is renamed to show all host tag groups to avoid confusion. In addition, all built-in groups are now also included.

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