Werk #13445: Allow single character names

Component	REST API
Title	Allow single character names
Date	Feb 7, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0p21 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Several endpoints (contact_group_config, password, service_group_config, host_group_config, and time_period) used a field which required at least two characters, although it was possible to create a one character name via the UI.

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