Werk #15258: Removed StatsGroupBy header from Livestatus protocol

Component	Livestatus
Title	Removed StatsGroupBy header from Livestatus protocol
Date	Jul 28, 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)

The StatsGroupBy header has been deprecated for almost 13 years now, just use the Columns instead.

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