Werk #15024: "+" is now an allowed character in user ids

Component	Setup
Title	"+" is now an allowed character in user ids
Date	Oct 23, 2023
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

"+" has been added as an allowed character in user ids. For example now "user+checkmk@company.com" is an allowed user id.

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